that's me testing a baby's vision ....

...and celebrating a friend's wedding

My main research interests involve studying the development of vision in normal infants, the consequences of visual deprivation during infancy, and the brain mechanisms underlying both normal and abnormal development. Recently, I talked about some of these ideas at a public lecture series entitled Science in City.

The normal development of vision. We are investigating developmental changes in visual abilities such as the perception of form and motion. The results to date suggest that aspects of vision requiring more steps of cortical processing are slower to develop than those requiring fewer steps of cortical processing.

The visual development of children treated for cataracts. To learn more about the importance of early visual experience on the development of vision, we have been studying an unusually large cohort of children who were deprived of normal visual input until they had surgery to remove dense central cataracts and were fitted with contact lenses. Studies in progress involve visual acuity, and the perception of form and motion. Deficits in these patients suggest that visual outcome is influenced by when the deprivation began, how long it lasted, and whether it occurred in one or both eyes. Moreover, the effects of early visual deprivation often differ for aspects of vision mediated by the primary visual cortex versus those mediated by higher cortical areas.

Brain mechanisms underlying visual development. We have been using brain imaging techniques to elucidate the mechanisms underlying normal and abnormal visual development. For example, we are using fMRI in collaboration with scientists at The Rotmann Research Institute and Sunnybrook Hospital in Toronto to find out why children treated for bilateral congenital cataract do unexpectedly poorly on some aspects of motion perception while children treated for unilateral congenital cataract do unexpectedly well on the same tasks. We are also using evoked related potentials (ERPs) in collaboration with scientists at Brock University and from New York State to tackle the same questions from a different point of view.

The results will provide insights into the developmental mechanisms driving changes in the perception of form and motion. The results will also have important clinical implications for understanding treatment protocols leading to an optimal visual outcome and may also provide a basis for new approaches to rehabilitation.

Publications

Ellemberg, D., Lavoie, K., Lewis, T.L., Maurer, D., Lepore, F., & Guillemot, J.-P. Longer VEP latencies and slower reaction times to the onset of second-order motion than to the onset of first-order motion. Vision Research, 2003, 43, 651-658.

Lewis, T.L., Ellemberg, D., Maurer, D., Wilkinson, F., Wilson, H.R., Dirks, M., & Brent, H.P. Sensitivity to global form in Glass patterns after early visual deprivation in humans. Vision Research, 2002, 42, 939-948.

Ellemberg, D., Lewis, T.L., Maurer, D., Brar, S., & Brent, H.P. Better perception of global motion after monocular than after binocular deprivation. Vision Research, 2002, 42, 169-179.

Ellemberg, D., Lewis, T.L. , Maurer, D., & Brent, H.P. The role of visual input in setting up spatial filters in the human visual system, Proceedings of PICS 2001: Image Processing, Image Quality, Image Capture, Systems Conference, The Society for Imaging Science and Technology, Springfield, VA 2001, 421-425.

Maurer, D., & Lewis, T.L. Visual acuity: the role of visual input in inducing postnatal change. Clinical Neuroscience Reaearch, 2001, 1, 239-247.

Goldberg, M.C., Maurer, D., Lewis, T.L., & Brent, H.P. The influence of binocular visual deprivation on the development of visual-spatial attention. Developmental Neuropsychology, 2001, 19, 55-83.

Goldberg, M.C., Maurer, D., & Lewis, T.L. Developmental changes in attention: The effects of endogenous cueing and of distractors. Developmental Science, 2001, 4, 208-218.

Maurer, D., & Lewis, T.L. Visual acuity and spatial contrast sensitivity: Normal development and underlying mechanisms. In C. A. Nelson and M. Luciana (Eds.). The handbook of developmental cognitive neuroscience. Boston, MA, MIT Press, 2001, 237-251.

Ellemberg, D., Lewis, T.L. , Maurer, D., & Brent, H.P. Influence of monocular deprivation during infancy on the later development of spatial and temporal vision. Vision Research, 2000, 40, 3283 - 3295.

Lewis, T.L. , Maurer, D., Chung, J.Y.Y., Holmes-Shannon, R., & Van Schaik, C.S. The development of symmetrical OKN in infants: Quantification based on OKN acuity for nasalward versus temporalward motion. Vision Research, 2000, 40, 445-453.

Mondloch, C.J., Lewis, T.L., Budreau, D.R., Maurer, D., Dannemiller, J.L., Stephens, B.R., & Kleiner K.A. Face perception during early infancy. Psychological Science, 1999, 10, 419-422.

Maurer, D., Lewis, T.L., Brent, H.P., & Levin, A.V. Visual input induces rapid improvement in the acuity of infants. Science, 1999, 286, 108-110.

Ellemberg, D., Lewis, T.L., Maurer, D., Liu, C.H., & Brent, H.P. Spatial and temporal vision in patients treated for bilateral congenital cataracts. Vision Research, 1999, 39, 3480-3489.

Ellemberg, D., Lewis, T.L., Liu, C.H., & Maurer, D. The development of spatial and temporal vision during childhood. Vision Research, 1999, 39, 2325-2333.

Maurer, D., & Lewis, T.L. Overt orienting toward peripheral stimuli: Normal development and underlying mechanisms. In J. E. Richards (Ed.), Cognitive neuroscience of attention: A developmental perspective. Mahwah, NJ: Erlbaum, 1998, 51-102.

Lewis, T.L. Editorial: Seeing beyond acuity. British Journal of Ophthalmology, 1998, 82, 982-983.

Mondloch, C.J., Lewis, T.L., Maurer, D., & Levin, A.V. The effects of visual experience on face preferences during infancy. Developmental Cognitive Neuroscience Technical Report, 1998, No.98.4.

Goldberg, M.C., Maurer, D., & Lewis, T.L. Influence of a central stimulus on infants' visual fields. Infant Behavior and Development, 1997, 20, 359-370.

Maurer, D., Nnubia, N., & Lewis, T.L. The effect of sucking on infants' orienting toward peripheral visual stimuli. Infant Behavior and Development, 1997, 20, 397-404.

Bowering, E.R., Maurer, D., Lewis, T.L., & Brent, H.P. Constriction of the visual field of children after early visual deprivation. Journal of Pediatric Ophthalmology and Strabismus, 1997, 34, 347-356.

Menzes, A.V., Lewis, T.L., & Buncic, J.R. The role of ocular involvement in the prediction of visual development and clinical prognosis in Aicardi syndrome. British Journal of Ophthalmology, 1996, 80, 805-811.

Bowering, E.R., Maurer, D., Lewis, T.L., Brent, H.P. & Riedel, P. The visual field in childhood: Normal development and the influence of deprivation. Developmental Cognitive Neuroscience Technical Report, 1996, No. 96.1.

Lewis, T.L., Maurer, D., & Brent, H.P. The development of grating acuity in children treated for unilateral or bilateral congenital cataract. Investigative Ophthalmology & Visual Science, 1995, 36, 2080-2095.

Tytla, M.E., Lewis, T.L., Maurer, D., & Brent, H.P. Stereopsis after congenital cataract. Investigative Ophthalmology & Visual Science, 1993, 34, 1767-1773.

Harris, L.R., Lewis, T.L., & Maurer, D. Brain stem and cortical contributions to the generation of horizontal optokinetic eye movements in humans. Visual Neuroscience, 1993, 10, 247-259.

Maurer, D., & Lewis, T.L. Visual outcomes after infantile cataract. In K. Simons (Ed.), Early visual development, Normal and abnormal. Committee on Vision, Commission on Behavioral and Social Sciences and Education, National Research Council. New York: Oxford University Press, 1993, 454-484.

Bowering, E.R., Maurer, D., Lewis, T.L., & Brent, H.P. Sensitivity in the nasal and temporal hemifields in children treated for cataract. Investigative Ophthalmology & Visual Science, 1993, 34, 3501-3509.

Lewis, T.L., Reed, M.J., Maurer, D., Wyngaarden, P.A., & Brent, H.P. An evaluation of acuity card procedures. Clinical Vision Sciences, 1993, 8, 591-602.

Lewis, T.L., & Maurer, D. The development of the temporal and nasal visual fields during infancy. Vision Research, 1992, 32, 903-911.

Lewis, T.L., Maurer, D., Tytla, M.E., Bowering, E., & Brent, H.P. Vision in the "good" eye of children treated for unilateral congenital cataract. Ophthalmology, 1992, 99, 1013-1017.

Lewis, T.L., Maurer, D., Smith, R.J., & Haslip, J.K. The development of symmetrical optokinetic nystagmus during infancy. Clinical Vision Sciences, 1992, 7, 211-218.

Maurer, D., & Lewis, T.L. The development of peripheral vision and its physiological underpinnings. In M.J. Weiss & P.R. Zelazo (Eds.), Newborn Attention: Biological constraints and the influence of experience. Norwood, N.J.: Ablex, 1991, 218-255.

Lewis, T.L., Maurer, D., & Brent, H.P. The development of visual resolution in infants and toddlers tested monocularly with optokinetic nystagmus. Clinical Vision Sciences, 1990, 5, 231-241.

Lewis, T.L., Maurer, D., & Brent, H.P. Optokinetic nystagmus in normal and visually deprived children: Implications for cortical development. Canadian Journal of Psychology, 1989, 43, 121-140.

Maurer, D., Lewis, T.L., Cavanagh, P., & Anstis, S. A new test of luminous efficiency for babies. Investigative Ophthalmology & Visual Science, 1989, 30, 297-303.

Maurer, D., Lewis, T.L., & Brent, H.P. The effects of deprivation on human visual development: Studies of children treated for cataracts. In F.J. Morrison, C.E. Lord, & D.P. Keating (Eds.), Applied developmental psychology, Vol. 3, Psychological development in infancy. San Diego, CA: Academic Press, 1989, 139-227.

Tytla, M.E., Maurer, D., Lewis, T.L., & Brent, H.P. Contrast sensitivity in children treated for congenital cataract. Clinical Vision Sciences, 1988, 2, 251-264.

Anstis, S., Cavanagh, P., Maurer, D., & Lewis, T. Optokinetic technique measures infants' responses to color. Applied Optics, 1987, 26, 1510-1516.

Lewis, T.L., Maurer, D., & Brent, H.P. Effects on perceptual development of visual deprivation during infancy. British Journal of Ophthalmology, 1986, 70, 214-220.

Anstis, S., Cavanagh, P., Maurer, D., Lewis, T., MacLeod, D.A., & Mather, G. Computer-generated screening test for color blindness. Color Research and Application, 1986, 11, S63-S66.

Lewis, T.L., & Maurer, D. Preferential looking as a measure of visual resolution in infants and toddlers: A comparison of psychophysical methods. Child Development, 1986, 57, 1062-1075.

Lewis, T.L., Maurer, D., & Brent, H.P. Optokinetic nystagmus in children treated for bilateral cataracts. In R. Groner, G.W. McConkie, & C. Menz (Eds.), Eye movements and human information processing. Amsterdam: North-Holland, 1985, 85-105.

Lewis, T.L., Maurer, D., & Blackburn, K. The development of young infants' ability to detect stimuli in the nasal visual field. Vision Research, 1985, 25, 943-950.

Maurer, D., Lewis, T.L., & Brent, H.P. Peripheral vision and optokinetic nystagmus in children with unilateral congenital cataract. Behavioural Brain Research, 1983, 10, 151-161.

Maurer, D., & Lewis, T.L. Review of Psychological Development from Infancy: Image to Intention. Edited by M. Bornstein & W. Kessen. Child Development Abstracts and Bibliography, 1981, 55, 72.

Maurer, D., & Lewis, T.L. The influence of peripheral stimuli on infants' eye movements. In D.F. Fisher, R.A. Monty, & J.W. Senders (Eds.), Eye movements: Cognition and visual perception. Hillsdale, New Jersey: Lawrence Erlbaum Associates, 1981, 21-29.

Lewis, T.L., & Maurer, D. Central vision in the newborn. Journal of Experimental Child Psychology, 1980, 29, 475-480.

Maurer, D., Siegel, L., Lewis, T.L., Kristofferson, M., Barnes, R., & Levy, B. Long-term memory improvement? Child Development, 1979, 50, 106-118.

Maurer, D., & Lewis, T.L. Peripheral discrimination by three-month-old infants. Child Development, 1979, 50, 276-279.

Maurer, D., & Lewis, T.L. A physiological explanation of infants' early visual development. Canadian Journal of Psychology, 1979, 33, 232-252.

Lewis, T.L., Maurer, D., & Kay, D. Newborns' central vision: whole or hole? Journal of Experimental Child Psychology, 1978, 26, 193-203.

Published Abstracts

Armstrong, V.L., Lewis, T.L., & Maurer, D. (2007). The development of sensitivity to first- and second-order pattern versus motion. Journal of Vision, in press.

Robbins, R., Maurer, D. & Lewis, T.L. (2007). Spaced out: Good discrimination but poor memory for spacing differences in houses. Journal of Vision, in press.

Lewis, T.L. Freire , A., & Maurer, D. (2007). Sparing of sensitivity to biological motion after early visual deprivation. Journal of Vision, in press.

Lewis, T.L., Chang, D.H.F., Murphy, K.M., Maurer, D., & Jones, D.G. (2006). Surround matters: The effects of context on the discrimination of orientation-in-noise in 7-year-olds and adults. Program No. 775.7. 2006 Abstract Viewer/Itinerary Planner. Atlanta, GA: Society for Neuroscience. Online. 

Armstrong, V.L., Lewis, T.L., & Maurer, D. (2006). Temporal frequency matters: Sensitivity to second-order stimuli in 5-year-olds and adults [Abstract]. Journal of Vision, 6(6), 291a, http://journalofvision.org/6/6/291/, doi:10.1167/6.6.291.

Lewis, T. L., Chang, D.H.F., Murphy, K.M., Maurer, D., & Jones, D.G. (2006). [Abstract]. Orientation discrimination in noise: 7-year-olds are noisier than adults. Journal of Vision, 6(6), 380a, http://journalofvision.org/6/6/380/, doi:10.1167/6.6.380.

Lewis, T.L., & Maurer, D. (2005). Uncovering interocular competition during development. Program No. 978.2. 2005 Abstract Viewer/Itinerary Planner. Washington, DC: Society for Neuroscience. Online.

Freire, A., Maurer, D., Lewis, T. L., & Blake, R. (2005). The ups and downs of point-light displays: Sensitivity to upright and inverted biological motion [Abstract]. Journal of Vision, 5(8), 20a, http://journalofvision.org/5/8/20/, doi:10.1167/5.8.20.

Armstrong, V. L., Lewis, T. L., & Maurer, D. (2005). Moving into adult vision: five-year-olds' immaturities in detecting second-order motion versus discriminating its direction [Abstract]. Journal of Vision, 5(8), 662a, http://journalofvision.org/5/8/662/, doi:10.1167/5.8.662.

Lewis, T. L., Kingdon, A., Ellemberg, D., & Maurer, D. (2005). Sensitivity to tilt in first-order and second-order gratings is immature in 5-year-olds [Abstract]. Journal of Vision, 5(8), 187a, http://journalofvision.org/5/8/187/, doi:10.1167/5.8.187.

Lewis, T.L., Kingdon, A., Ellemberg, D., & Maurer, D. (2004) Orientation discrimination in 5-year-olds and adults tested with luminance-modulated and contrast-modulated gratings. Program No. 986.4. 2004 Abstract Viewer/Itinerary Planner. Washington, DC: Society for Neuroscience, 2004. Online.

O'Craven, K. M., LeGrand, R., Maurer, D., Mondloch, C. J., Pellicori, G., Lewis, T. L., & Grady, C. L. (2004). Neural correlates of featural versus configural face processing in visually normal adults. Program No. 525.4. 2004 Abstract Viewer/Itinerary Planner. Washington, DC: Society for Neuroscience, 2004. Online.

Maurer, D., & Lewis, T. L. (2004). Lessons about visual rehabilitation from children treated for cataracts [Abstract]. Journal of Vision, 4(11), 30a, http://journalofvision.org/4/11/30/, doi:10.1167/4.11.30.

Lewis, T. L., Ellemberg, D., Maurer, D., Guillemot, J.-P., & Lepore, F. (2004). Motion perception in 5-year-olds: Immaturity is related to hypothesized complexity of cortical processing [Abstract]. Journal of Vision, 4(8), 30a, http://journalofvision.org/4/8/30/, doi:10.1167/4.8.30.

Armstrong, V. L., Lewis, T. L., Ellemberg, D., Bhagirath, V. C., & Maurer, D. (2004). Comparison of sensitivity to first- and second-order information in infants, children, and adults [Abstract]. Journal of Vision, 4(8), 31a, http://journalofvision.org/4/8/31/, doi:10.1167/4.8.31.

O'Craven, K. M., LeGrand, R., Maurer, D., Mondloch, C. J., Pellicori, G., Lewis, T. L., & Grady, C. L. (2004). Neural correlates of featural versus configural face processing in visually normal adults [Abstract]. Journal of Vision, 4(8), 907a, http://journalofvision.org/4/8/907/, doi:10.1167/4.8.907.

Freire, A., Maurer, D., Lewis, T. L., & Blake, R. (2004). Adults are better than 6-year-olds at perceiving biological motion in noise [Abstract]. Journal of Vision, 4(8), 235a, http://journalofvision.org/4/8/235/, doi:10.1167/4.8.235.

Lewis, T.L., Ellemberg, D., & Maurer, D. (2003)  The ups and downs of motion processing in children. Program No. 591.20. 2003 Abstract Viewer/Itinerary Planner. Washington, DC: Society for Neuroscience, 2003. Online.

Mackay, T.L., Jakobson, L.S., Ellemberg, D.,  Lewis, T.L., Maurer, D., & Casiro, O. (2003). Deficits in the processing of local and global motion in very low birthweight children. [Abstract]. Journal of Vision , 3(9), 289a, http://journalofvision.org/3/9/289, doi:10.1167/3.9.289.

Lewis, T.L.,  Bhagirath, V.C.. Ellemberg, D.,  & Maurer, D. (2003). Greater immaturity in sensitivity to second-order gratings than to first-order gratings during infancy [Abstract]. Journal of Vision, 3(9), 530a, http://journalofvision.org/3/9/530, doi:10.1167/3.9.530.

Ellemberg, D., Lewis, T. L., Lee, B., & Maurer, D. (2002). Motion detection and velocity discrimination are still immature in 5-year-olds [Abstract]. Journal of Vision, 2(7), 646a, http://journalofvision.org/2/7/646/, DOI 10.1167/2.7.646.

Lewis, T. L., Ellemberg, D., Maurer, D., Lee, B., Brent, H. P., & Levin, A. V. (2002). The effects of early pattern deprivation on the development of the ability to detect local motion and to discriminate its velocity [Abstract]. Journal of Vision, 2(7), 25a, http://journalofvision.org/2/7/25/, DOI 10.1167/2.7.25.

Lewis,T.L. Congenital cataract: Seeing beyond acuity. Investigative Ophthalmology & Visual Science, 2001, 42, S312.

Lewis,T.L., Ellemberg, D., Maurer, D.,.Dirks, M., Wilkinson, F., Wilson, H.R.., & Brent. H.P. Sensitivity to global form in normal and visually deprived children. Investigative Ophthalmology & Visual Science, 2001, 42, S301.

Ellemberg, D., Lavoie, K., Lewis, T.L., Maurer, D., Lepore, F., Guillemot J-P. VEPs and reaction times confirm additional processing for second order compared to first-order motion. Society for Neuroscience, 2000, 26, 1844.

Ellemberg, D., Lewis,T.L., Meghji, K.S., Maurer, D. Sensitivity to first- and second-order local motion in 5-year-olds and adults. Investigative Ophthalmology & Visual Science, 2000, 41, S727.

Lewis, T.L., Ellemberg, D., Maurer, D., & Brent, H.P. Changes in spatial vision during middle childhood in patients treated for congenital cataract. Investigative Ophthalmology & Visual Science, 2000, 41, S726.

Ellemberg, D., Lewis, T.L., Brar, S., Maurer, D., & Brent, H.P. The effects of pattern deprivation on the development of the perception of global motion. Investigative Ophthalmology & Visual Science, 1999, 40, S396.

Lewis, T.L., Ellemberg, D., Maurer, D., & Brent, H.P. Influence of early monocular deprivation on spatial and temporal vision. Investigative Ophthalmology & Visual Science, 1999, 40, S409.

Ellemberg, D., Lewis,T.L., Liu, C.H., Maurer, D., & Brent, H.P. The development of spatial and temporal vision in normal children and in children treated for bilateral congenital cataracts. Investigative Ophthalmology & Visual Science, 1998, 39, S1088 .

Lewis, T.L., Mondloch, C.J., Budreau, D.R., Maurer, D., Dannemiller, J.L., Stephens, B.R., & Kleiner K.A. Face perception in young infants. Infant Behavior & Development, 1998, 21, 535.

Geldart, S., Mondloch, C.J., Maurer, D., de Schonen, S., Lewis, T.L., & Brent, H.P. The effect of early visual deprivation on the development of face processing. Infant Behavior & Development, 1998, 21, 428.

Goldberg, M.C., Maurer, D., Lewis, T.L., & Brent, H.P. Influence of binocular deprivation on the development of attention. Investigative Ophthalmology & Visual Science, 1997, 38, S65.

Lewis, T.L., Maurer, D., Anvari, S.H., & Jewell, D. The influence of flicker on infants' orienting toward peripheral targets. Investigative Ophthalmology & Visual Science, 1997, 38, S64.

Lewis, T.L., Maurer, D., Burhanpurkar, A., & Anvari, S.H. The influence of flicker on 3-month-olds' peripheral vision. Investigative Ophthalmology & Visual Science, 1996, 37, S1067.

Lewis, T.L., Maurer, D., & Brent. H.P. Plasticity of the human visual system after early pattern deprivation. Investigative Ophthalmology & Visual Science, 1995, 36, S869.

Lewis, T.L., Maurer, D., & Brent, H.P. The visual development of children treated for congenital cataract. Infant Behavior & Development, 1994, 17, 270.

Lewis, T.L., Maurer, D., & Brent, H.P. The effects of age at treatment and occlusion therapy on the grating acuity of infants treated for congenital cataract. Investigative Ophthalmology & Visual Science, Supplement, 1993, 34, 1351.

Maurer, D., Lewis, T.L., & Brent, H.P. The influence of visual deprivation on the development of color vision. Investigative Ophthalmology & Visual Science, Suppl., 1993, 34, 1356.

Goldberg, M.C., Maurer, D., & Lewis, T.L. The influence of a central stimulus on infants' visual fields. Investigative Ophthalmology & Visual Science, Suppl., 1993, 34, 1354.

Bowering, E., Maurer, D., Lewis, T.L., & Brent, H.P. The visual field of children treated for dense and central cataracts. Canadian Psychology, 1992, 33, 369.

Lewis, T.L., Maurer, D., & Brent, H.P. OKN Acuity for nasal versus temporal motion in children treated for bilateral cataracts. Investigative Ophthalmology & Visual Science, Suppl., 1992, 33, 1340.

Nnubia, N.A., Maurer, D., & Lewis, T.L. The effect of sucking on infants' orientation toward peripheral visual stimuli. Infant Behavior & Development, 1992, 15, 603.

Lewis, T.L., Maurer, D., & Holmes, R.R. The development of OKN acuity for nasalward versus temporalward motion. Investigative Ophthalmology & Visual Science, Suppl., 1991, 32, 961.

Tytla, M.E., Lewis, T.L., Maurer, D., & Brent, H.P. Peripheral contrast sensitivity in children treated for congenital cataract. Investigative Ophthalmology & Visual Science, Suppl., 1991, 32, 819.

Maurer, D., & Lewis, T.L. The influence of a central stimulus on newborns' effective visual field. Investigative Ophthalmology & Visual Science, Suppl., 1991, 32, 963.

Bowering, E.R., Maurer, D., Lewis, T.L., & Brent, H.P. Thresholds in the periphery of normal and visually deprived children. Investigative Ophthalmology & Visual Science, Suppl., 1991, 32, 962.

Wyngaarden, P.A., Maurer, D., Lewis, T.L., Harvey, P., & Rosenbaum, P. The relationship between developmental delay and grating acuity. Investigative Ophthalmology & Visual Science, Suppl., 1991, 32, 961.

Harris, L.R., Lewis, T.L., & Maurer, D. Plaids used to evaluate cortical and subcortical involvement in human optokinetic nystagmus (OKN). Investigative Ophthalmology & Visual Science, Suppl., 1991, 32, 1021.

Maurer, D., Lewis, T.L., & Brent, H.P. The differential effect of visual deprivation on the development of shape discrimination and visual acuity. Perception, 1990, 19, 274.

Tytla, M.E., Lewis, T.L., Maurer, D., & Brent, H.P. The vernier acuity of children treated for congenital cataract. Canadian Journal of Ophthalmology, 1990, 25, 106.

Tytla, M.E., Lewis, T.L., Maurer, D., & Brent, H.P. Vernier acuity after congenital cataract. Investigative Ophthalmology & Visual Science, Suppl., 1990, 31, 252.

Lewis, T.L., Maurer, D., & Van Schaik, C.S. Monocular OKN acuity is asymmetrical in normal 3-month-olds. Investigative Ophthalmology & Visual Science, Suppl., 1990, 31, 7.

Wyngaarden, P.A., Maurer, D., Lewis, T.L., Harvey, P., & Rosenbaum, P. Preferential Looking and Teller Acuity Cards as screening instruments. Investigative Ophthalmology & Visual Science, Suppl., 1990, 31, 607.

Lewis, T.L., & Maurer, D. The development of temporal and nasal detection as measured by static perimetry with a 6o light. Infant Behavior & Development, 1990, 13, 485.

Bowering, E.R., Maurer, D., Lewis, T.L., Brent, P., & Brent, H.P. Development of peripheral vision in normal and binocularly deprived children. Ophthalmic and Physiological Optics, 1989, 9, 471.

Bowering, E., Maurer, D., Lewis, T.L., Brent, P., & Brent, H.P. Development of vision in normal and binocularly deprived children. Canadian Psychology, 1989, 30, 248.

Lewis, T.L., Maurer, D., Tytla, M.E., Bowering, E., & Brent, H.P. Vision in the "good" eye of children treated for unilateral congenital cataract. Canadian Journal of Ophthalmology, 1989, 24, 91.

Tytla, M.E., Lewis, T.L., Maurer, D., & Brent, H.P. Stereopsis after congenital cataract. Canadian Journal of Ophthalmology, 1989, 24, 91.

Reed, M.J., Lewis, T.L., Maurer, D., Wyngaarden, P., & Brent, H.P. A comparison of three acuity card procedures. Investigative Ophthalmology & Visual Science, Suppl., 1989, 30, 143.

Bowering, E., Maurer, D., Lewis, T.L., Brent, P., & Brent, H.P. Development of the visual field in normal and binocularly deprived children. Investigative Ophthalmology & Visual Science, Suppl., 1989, 30, 377.

Tytla, M.E., Lewis, T.L., Maurer, D., Brent, H.P. Stereopsis following congenital cataract? Investigative Ophthalmology & Visual Science, Suppl., 1989, 30, 303.

Maurer, D., Lewis, T.L., & Brent, H.P. Preferential looking and optokinetic nystagmus: Concurrent and predictive validity. Investigative Ophthalmology & Visual Science, Suppl., 1989, 30, 408.

Lewis, T.L., Maurer, D., Tytla, M.E., Bowering, E., & Brent, H.P. Vision in the "normal" eye of children treated for unilateral congenital cataract. Investigative Ophthalmology & Visual Science, Suppl., 1989, 30, 376.

Lewis, T.L. & Maurer, D. Peripheral vision in normal infants: Comparison to animal studies. Infant Behavior & Development, 1988, 11, 420.

Lewis, T.L., Maurer, D., & Brent, H.P. Effects of monocular deprivation on optokinetic nystagmus in humans. Investigative Ophthalmology & Visual Science, Suppl., 1988, 29, 346.

Lewis, T.L., Maurer, D., & Brent, H.P. Effects on perceptual development of visual deprivation during infancy. Ophthalmology Digest, 1987, 2, 21-22.

Tytla, M.E., Lewis, T.L., Maurer, D., & Brent, H.P. Contrast Sensitivity following congenital cataract. Canadian Journal of Ophthalmology, 1987, 22(2), 124.

Lewis, T.L., Maurer, D., & Brent, H.P. Grating acuity of children treated for bilateral congenital cataracts. Investigative Ophthalmology & Visual Science, Suppl., 1987, 28, 324.

Smith, R.J., Haslip, J.K., Lewis, T.L., & Maurer, D. The development of optokinetic nystagmus during infancy. Investigative Ophthalmology & Visual Science, Suppl., 1987, 28, 313.

Anstis, S., Maurer, D., Lewis, T., & Cavanagh, P. Optokinetic test of infant color vision. Proceedings of the Optical Society of America. Second topical meeting on Noninvasive Assessment of the Visual System, 1986.

Maurer, D., Clarke, A.L., & Lewis, T.L. The development of peripheral detection during infancy. Investigative Ophthalmology & Visual Science, Suppl., 1986, 27, 264.

Anstis, S., Cavanagh, P., Maurer, D., & Lewis, T. Early maturation of luminous efficiency for colored stimuli. Investigative Ophthalmology & Visual Science, Suppl., 1986, 27, 264.

Tytla, M.E., Maurer, D., Lewis, T.L., & Brent, H.P. Spatial contrast sensitivity in cases of unilateral and bilateral congenital cataract. Investigative Ophthalmology & Visual Science, Suppl., 1986, 27, 153.

Brent, H.P., Lewis, T.L., & Maurer, D. Effect of binocular deprivation from cataracts on development of Snellen acuity. Investigative Ophthalmology & Visual Science, Suppl., 1986, 27, 151.

Lewis, T.L., & Maurer, D. A short staircase for estimating acuity from preferential looking. Investigative Ophthalmology & Visual Science, Suppl., 1986, 27, 76.

Maurer, D., Jobson, S., & Lewis, T.L. The development of peripheral acuity. Infant Behavior & Development, 1986, 9, 245.

Lewis, T., Maurer, D., Haslip, J., Smith, R., & Brent, H. Optokinetic nystagmus in normal infants and binocularly deprived children: Comparison to animal studies. Infant Behavior & Development, 1986, 9, 227.

Lewis, T.L., Maurer, D., & Brent, H.P. Effects of binocular deprivation on optokinetic nystagmus in humans. Investigative Ophthalmology & Visual Science, Suppl., 1985, 256.

Maurer, D., Lewis, T.L., & Brent, H.P. A comparison of methods for assessing vision in infants treated for cataracts. Investigative Ophthalmology & Visual Science, Suppl., 1985, 212.

Brent, H.P., Maurer, D., & Lewis, T.L. The visual development of children treated for congenital cataracts. Canadian Journal of Ophthalmology, 1984, 19, 81.

Brent, H.P., Maurer, D., & Lewis, T.L. Effects of timing and duration of monocular deprivation in children. Investigative Ophthalmology & Visual Science, Suppl., 1984, 25, 217.

Lewis, T.L., Maurer, D., Blackburn, K., & Brent, H.P. Experience influences the development of detection in the nasal visual field in humans. Investigative Ophthalmology & Visual Science, Suppl., 1984, 25, 220.

Lewis, T.L., Maurer, D., & Brent, H.P. Optokinetic nystagmus and preferential looking as measures of visual resolution in children treated for congenital cataracts. Infant Behavior & Development, 1984, 7, 94.

Lewis, T.L., Maurer, D., & Brent, H.P. The effects of visual deprivation during infancy on perceptual development. Infant Behavior & Development, 1984, 7, 215.

Maurer, D., Lewis, T.L., & Tytla, M.E. Contrast sensitivity in cases of unilateral congenital cataract. Investigative Ophthalmology & Visual Science, Suppl., 1983, 24, 21.

Lewis, T.L., Maurer, D., & Brent, H.P. The development of visual resolution following treatment for bilateral congenital cataracts. Investigative Ophthalmology & Visual Science, Suppl., 1983, 24, 133.

Brent, H.P., Lewis, T.L., & Maurer, D. Contact lens fitting in aphakic infants. Investigative Ophthalmology & Visual Science, Suppl., 1982, 22, 218.

Lewis, T.L., Maurer, D., & Milewski, A. The development of nasal field detection in young infants. Investigative Ophthalmology & Visual Science, Suppl., 1979, 271.

Lewis, T.L. The development of nasal field detection in young infants. (Doctoral dissertation, McMaster University). Dissertation Abstracts International, 1980, 41B, 1547.

Presentations at Conferences without Published Abstracts

Maurer, D., & Lewis, T.L. The role of visual input in the postnatal development of human visual perception: Lessons from children treated for cataract. In D. Shore, Plasticity: From behaviour to neurons. Symposium presented at the annual meeting of the Canadian Society for Brain, Behaviour, and Cognitive Science, Hamilton, June 2003. (Contributed)

Lewis, T.L., Ellemberg, D., Maurer, D. Seeing beyond acuity. Paper presented at the annual meeting of the Canadian Society for Brain, Behaviour, and Cognitive Science, Hamilton, June 2003. (Contributed)

Armstrong, V., Lewis, T.L., Ellemberg, D., Bhagirath, V., Maurer, D. A method for assessing developmental changes in sensitivity to first-order and second-order information. Presented at the annual meeting of the Canadian Society for Brain, Behaviour, and Cognitive Science, Hamilton, June 2003 (Contributed) and at the York Vision Meeting, Toronto, June 2003. (Contributed)

Lewis, T.L Looking at Babies’ Vision. Symposium presented at the XIIIth Biennial International Conference on Infant Studies, Toronto, April 2002. (Contributed)

Maurer, D. & Lewis, T.L. The effects of visual deprivation on human visual development: Lessons from children treated for cataract. In D. Bavelier (Chair): Developmental Brain Plasticity: A Search for Boundary Conditions. Paper presented at The Cognitive Neuroscience Society, San Francisco, April 2002. (Contributed)

Lewis, T.L. Vision testing in infants and children. Workshop presented at the Pediatric Glaucoma and Cataract Family Association Annual Education Day, Toronto, November, 2001. (invited).

Ellemberg, D., Lewis, T.L. , Dirks, M., Maurer, D., Ledgeway, T., Lepore, F., & Guillemot, J-P. Sensitivity to first- and second-order global motion in 5-year-olds and adults. Paper presented at the bienniel meeting of the European Conference on Visual Perception, Turkey, August 2001. (Contributed)

Lewis, T.L. Vision after treatment for infantile cataract: An update and some surprises. Paper presented at the Canadian Orthoptics Society, Toronto, June 2001. (invited)

Ellemberg, D., Lewis, T.L. , Maurer, D., & Brent, H.P. The role of visual input in setting up spatial filters in the human visual system, Proceedings of PICS 2001: Image Processing, Image Quality, Image Capture, Systems Conference, The Society for Imaging Science and Technology, Montreal, Que, April, 2001. (invited)

Maurer, D., & Lewis, T.L. Visual acuity: the role of visual input in inducing postnatal change. Paper presented at the joint meeting of the Association for Research on Nervous and Mental Diseases and the New York Academy of Medicine on Normal and Pathological Development of the Nervous System. New York, December 2000 (invited).

Mondloch, C.J., Maurer, D., LeGrand, R., Geldart, S., deSchonen, S., Lewis, T.L., Brent, H.P., & Levin, A.V. The effects of early visual deprivation on the development of cortical specialization for face perception. In C. Mondloch (Chair). The development of cortical specialization: lessons from studies of face processing. Paper presented to the XIIth Biennial International Conference on Infant Studies, Brighton, UK, July 2000. (Contributed)

Lewis, T.L., Ellemberg, D., Maurer, D., Defina, N., & Brent, H.P. The perception of local and global motion after early pattern deprivation in humans. In T.L. Lewis (Chair), Understanding the development of motion perception. Paper presented the joint meeting of the Canadian Society for Brain, Behaviour, and Cognitive Science and of the Experimental Psychology Society, Cambridge, UK, July 2000. (Contributed)

Lewis, T.L (2000). Understanding the development of motion perception. Symposium presented at the joint meeting of the Canadian Society for Brain, Behaviour, and Cognitive Science and of the Experimental Psychology Society, Cambridge, UK, July 2000. (Contributed)

Lewis, T.L., Maurer, D., Ellemberg, D., Brent, H.P., & Levin, A.V. Making and breaking rules: Vision after monocular versus binocular deprivation during early infancy. In T.L. Lewis (Chair), The effects of experience on perceptual development. Paper presented to the XIIth Biennial International Conference on Infant Studies, Brighton, UK, July 2000. (contributed)

Lewis, T.L (2000). The effects of experience on perceptual development. Symposium presented to the XIIth Biennial International Conference on Infant Studies, Brighton, UK, July 2000. (Contributed)

Maurer, D., Lewis, T.L., Brent, H.P., & Levin, A.V. Recovery from visual deprivation. Paper presented at the International Society for the Study of Behvioural Development, Bejing, July 2000. (Contributed)

Lewis, T.L., Ellemberg, D., Maurer, D., & Brent, H.P. Changes in spatial vision during middle childhood in patients treated for congenital cataract. Presented at the In-house Conference, McMaster University, June 2000. (invited)

Lewis, T.L., Ellemberg, D., Brar, S., Maurer, D., & Brent, H.P. Global motion upsets the apple-cart. Presented at the In-house Conference, McMaster University, June 1999. (invited)

Ellemberg, D., Lewis, T.L., Brar, S., Maurer, D., & Brent, H.P. Sometimes one eye is better than two: perception of global motion after monocular versus binocular deprivation. Presented at the International Conference on Vision and Attention, Toronto, June 1999. (contributed)

Maurer, D., Lewis, T.L., Brent, H.P., & Levin, A.V. Visual input induces rapid improvement in infants' acuity. Paper presented at the Child Vision Research Society, London, UK, June 1999. (Contributed)

Mondloch, C.J., Geldart, S., Maurer, D., de Schonen, S., Lewis, T.L., & Brent, H.P. The importance of early visual experience for the development of face processing. Presented at the European Research Conferences: Brain Development and Cognition in Human Infants, Barcelona, Spain, September 1998. (contributed).

Maurer, D., & Lewis, T.L. Does the cortex learn to see? Visual development in normal children and in children treated for congenital cataract. Presented at the European Research Conferences: Brain Development and Cognition in Human Infants, Barcelona, Spain, September 1998. (invited).

Ellemberg, D., Lewis, T.L., Liu, C.H., Maurer, D., & Brent, H.P. Spatial and temporal vision in children treated for unilateral congenital cataract. Canadian Society for Behaviour, Brain, and Cognitive Science, Ottawa, June 1998. (contributed).

Geldart, S., Mondloch, C. J., Maurer, D., de Schonen, S., Lewis, T.L., & Brent, H.P. The effect of early visual deprivation on the development of face processing. Presented at the In-house Conference, McMaster University, June 1998. (invited)

Lewis, T.L., Mondloch, C.J., Budreau, D.R., Maurer, D., Dannemiller, J.L., Stephens, B.R., & Kleiner K.A. Face perception in young infants. Presented at the In-house Conference, McMaster University, June 1998. (Invited)

Geldart, S., Mondloch, C., Maurer, D., de Schonen, S., Lewis, T.L., & Brent, H.P. The effect of early visual deprivation on the development of face processing. University of Waterloo Conference on Child Development, Waterloo, May 1998. (contributed).

Budreau, R., Mondloch, C., Lewis, T.L., & Maurer, D. Face preferences during early infancy. Presented at the In-house Conference, McMaster University, June 1997. (invited)

Ellemberg, D., Liu, C.H., Lewis, T.L., & Maurer, D. Do spatial and temporal vision develop at different rates during childhood? Presented at the In-house Conference, McMaster University, June 1997. (invited)

Lewis, T.L., Maurer, D., Burkanpurkar, A., Anvari, S., & Jewell, D. Will babies orient more toward a light if it's flickering? Presented at the In-house Conference, McMaster University, June 1997. (invited)

Maurer, D., Lewis, T.L., Burhanpurkar, A., Anvari, S., & Jewell, D. The influence of flicker on infants' peripheral vision. Presented at the Society for Research in Child Development, Washington, March 1997. (contributed)

Lewis, T.L., Maurer, D., & Brent, H.P. The effects of pattern deprivation on human visual development. In J. Atkinson (Chair), The influence of experience on the development of perception. Symposium conducted at the XXVI International Congress of Psychology, Montreal, August 1996. (invited)

Maurer, D., Lewis, T.L., & Brent, H.P. Visual acuity after treatment for infantile cataract. Paper presented at the Second International Congenital Cataract Symposium, London, June 28-29, 1996. (invited)

Lewis, T.L., Maurer, D., Burhanpurkar, A., & Anvari, S. The influence of flicker on 3-month-olds' peripheral vision. Presented at the In-house Conference, McMaster University, June 1996. (invited)

Lewis, T.L., Maurer, D. & Brent, H.P. Plasticity of the human visual system after early pattern deprivation. Presented at the In-house Conference, McMaster University, June 1996. (invited)

Lewis, T.L. Maurer, D., & Brent, H.P. Vision testing in infants: A best method? Presented at the 8th Annual Jack Crawford Pediatric Ophthalmology Meeting: Controversies in Pediatric Ophthalmology, Toronto, May 10-11, 1996. (invited)

Goldberg, M., Maurer, D., & Lewis, T. Age differences in covert orienting initiated by informative central cues. Presented at The Cognitive Neuroscience Society, San Francisco, March 1996. (contributed)

Lewis, T.L., Maurer, D., & Wyngaarden, P.A. Measuring visual acuity in developmentally delayed and neurologically handicapped infants. Presented at the 7th Annual Jack Crawford Pediatric Ophthalmology Meeting, Toronto, March 25-26, 1995. (invited)

Goldberg, M., Maurer, D., & Lewis, T. Time course of covert shifts of attention with endogenous cues. Presented at The Cognitive Neuroscience Society, San Francisco, March 24-28, 1995. (contributed)

Maurer, D., Lewis, T.L., & Brent, H.P. Plasticity of the visual system during the first year of life. Presented at the Society for Research in Child Development, Indianapolis, March 1995. (contributed)

Lewis, T.L., Maurer, D., & Brent, H.P. The influence of visual deprivation on visual development. Presented at the XIIIth Biennial Meeting of the International Society for the Study of Behavioural Development, Amsterdam, The Netherlands, June 28-July 2, 1994. (contributed).

Lewis, T.L., Maurer, D., & Brent, H.P. Infant cataracts: Visual results. Presented at the 6th Annual Jack Crawford Pediatric Ophthalmology Meetings, Toronto, March 1994. (invited).

Lewis, T.L., Maurer, D., & Brent, H.P. Testing visual development in the first year: Clinical aspects. Presented at the 6th Annual Jack Crawford Pediatric Ophthalmology Meeting, Toronto, March 1994. (invited).

Lewis, T.L., Maurer, D., & Brent, H.P. The visual development of children treated for congenital cataract. In D. Maurer (Chair), The influence of experience on the development of perception. Symposium conducted at the joint meeting of the Canadian Society for Brain, Behaviour, and Cognitive Science and of the Experimental Psychology Society, Toronto, July 15-17, 1993. (contributed)

Lewis, T.L., Maurer, D., & Brent, H.P. Measuring babies' vision. Presented at the Eastern Regional Orthoptic Meeting, Toronto, May 16, 1993. (invited).

Lewis, T.L., Maurer, D., & Brent, H.P. The development of colour vision in children treated for congenital cataract. Presented at the Thirty-fifth Annual Departmental Research Day, University of Toronto, April 1993. (invited)

Lewis, T.L., Maurer, D., & Brent, H.P. Grating acuity of children treated for congenital cataract. In E.E. Hartmann (Chair), Infant vision assessment: Moving beyond methodological and technological advances with an eye to clinical populations. Symposium conducted at the biennial meeting of the Society for Research in Child Development, New Orleans, March 1993. (contributed)

Nnubia, N.A., Maurer, D., & Lewis, T.L. The effect of sucking on infants' orientation toward peripheral visual stimuli. Presented at the University of Waterloo Conference on Child Development, Waterloo, May 1992. (contributed).

Wyngaarden, P.A., Maurer, D., Lewis, T.L., Harvey, P., & Rosenbaum, P. On the relationship between developmental delay and grating acuity. Presented at the University of Waterloo Conference on Child Development, Waterloo, May 1992.

Lewis, T.L., Maurer, D., & Brent, H.P. OKN acuity for nasalward versus temporalward motion in children treated for bilateral cataracts. Presented at the Thirty-fourth Annual Department Research Day, Toronto, April 1992. (contributed).

Wyngaarden, P.A., Maurer, D., Lewis, T.L., Harvey, P., & Rosenbaum, P. Achievements in acuity testing of developmentally disabled children: How well do Teller Acuity Cards compare to traditional preferential looking methods? Presented at the annual meeting of the Ontario Association on Developmental Disabilities, Toronto, March 1992. (contributed).

Maurer, D., & Lewis, T.L. Visual outcomes in infant cataract. Paper presented at the "Symposium on Infant Vision Research 1990", sponsored by the Committee on Vision, National Research Council Commission on Behavioral and Social Sciences and Education, Irvine CA, March 1991. (invited)

Wyngaarden, P.A., Maurer, D., Lewis, T.L., Harvey, P., & Rosenbaum, P. Measuring the visual acuity of developmentally disabled infants and children: Relationship to cognitive level. Presented at the Ontario Association on Developmental Disabilities, London, March 1990. (contributed)

Lewis, T.L., Tytla, M.E., Maurer, D., Bowering, E., & Brent, H.P. Vision in the fellow "good" eye of children treated for unilateral congenital cataract. Presented at the Jack Crawford Annual Paediatric Ophthalmology Conference, Toronto, March 1990 (invited).

Lewis, T.L., Maurer, D., Wyngaarden, P.A. & Brent, H.P. Measuring the vision of preverbal and delayed children. Presented at the Seventh Canadian Interdisciplinary Conference on the Visually Impaired Child, Toronto, November 1989. (contributed)

Maurer, D., Lewis, T.L., & Brent, H.P. The differential effect of visual deprivation on the development of shape discrimination and of visual acuity. Presented at the Tenth Biennial Meeting of the International Society for the Study of Behavioural Development, Jyväskylä, Finland, July 1989 (contributed) and at the Fifth International Symposium of the Northern Eye Institute, Bristol, England, July 1989 (contributed).

Tytla, M.E., Lewis, T.L., Maurer, D., & Brent, H.P. Stereopsis following congenital cataract? Presented at the Scientific Retreat of the Research Institute of The Hospital for Sick Children, December, 1989 (invited) and at the Jack Crawford Annual Paediatric Ophthalmology Conference, Toronto, March 1990 (invited).

Lewis, T.L., Maurer, D., Tytla, M.E., Bowering, E., & Brent, H.P. Vision in the "good" eye of children treated for unilateral congenital cataract. Presented at the Scientific Retreat of the Research Institute of The Hospital for Sick Children, December, 1989 (invited).

Tytla, M.E., Lewis, T.L., Maurer, D., & Brent, H.P. Stereopsis after unilateral or bilateral congenital cataract. Department of Ophthalmology Research Day, University of Toronto, May 1989. (invited)

Tytla, M.E., Lewis, T.L., Maurer, D., & Brent, H.P. Contrast sensitivity following congenital cataract. Presented at the Jack Crawford Annual Paediatric Ophthalmology Conference, Toronto, March 1989 (invited).

Tytla, M., Maurer, D., Lewis, T., & Brent, H. Visual acuities following early form deprivation. Presented at The Thirtieth Annual Departmental Research Day, and The Eight Clement McCulloch Lecture, Toronto, April 1988. (Invited)

Lewis, T.L., Maurer, D., & Soleas, C. Peripheral detection in 1-month-olds: Influence of stimulus' size. Presented at the Society for Research in Child Development, Balitmore, April 1987. (contributed)

Tytla, M., Lewis, T., Maurer, D., & Brent, H. Contrast sensitivity in children treated for congenital cataract. Presented at The Twenty-ninth Annual Departmental Research Day and The Seventh Clement McCulloch Lecture, Toronto, April 1987. (Invited)

Lewis, T.L., Maurer, D., & Brent, H.P. Visual results in children treated for unilateral congenital cataract. Presented at the American Association for Pediatric Ophthalmology and Strabismus, Scottsdale, Arizona, March 1987. (invited).

Lewis, T.L., Maurer, D., & Brent, H.P. Grating acuity of children treated for bilateral congenital cataracts. Presented at the American Association for Pediatric Ophthalmology and Strabismus, Scottsdale, Arizona, March 1987. (contributed)

Lewis, T.L., Maurer, D., & Brent, H.P. Visual acuity assessment in infants with cataracts. Presented at the American Academy of Optometry, Toronto, December 1986. (invited)

Smith, R.J., Haslip, J.K., Lewis, T.L., & Maurer, D. The effect of stimulus velocity on optokinetic nystagmus during infancy. Presented at the Canadian Psychological Association, Toronto, June 1986. (contributed)

Cooper, B.A., Maurer, D., Lewis, T.L., & Brent, H.P. Effects of deprivation from congenital cataracts on the development of colour vision: Preliminary findings. Presented at the Canadian Psychological Association, Toronto, June 1986. (contributed)

Bowering E., Maurer, D., Lewis, T., Brent, P., & Brent, H. The development of the visual field in normal and aphakic children: Preliminary findings. Presented at the Canadian Psychological Association, Toronto, June 1986. (contributed)

Cavanagh, P., Anstis, S., Maurer, D., Lewis, T., & Stone, M. Computer-generated screening test for color blindness. Presented at the interim meeting of the International Colour Association, Toronto, June 1986. (invited)

Smith, R.J., Haslip, J.K., Lewis, T.L., & Maurer, D. The effect of stimulus velocity on optokinetic nystagmus during infancy. Presented at the Conference on Child Development, Waterloo, Ontario, May 1986. (contributed)

Cooper, B.A., Maurer, D., Lewis, T.L., & Brent, H.P. Effects of deprivation from congenital cataracts on the development of colour vision: Preliminary findings. Presented at the Conference on Child Development, Waterloo, Ontario, May 1986. (contributed)

Bowering, E., Maurer, D., Lewis, T., Brent, P., & Brent, H. The development of the visual field in normal and aphakic children: Preliminary findings. Presented at the Conference on Child Development, Waterloo, Ontario, May 1986. (contributed)

Lewis, T.L. (Chair). The development of peripheral vision: new methods and initial findings. Symposium conducted at the meeting of the International Conference on Infant Studies, Los Angeles, April 1986. (contributed)

Anstis, S., Maurer, D., Lewis, T., & Cavanagh, P. Optokinetic test for color vision in babies. Presented at the Optical Society of America, second topical meeting on Noninvasive Assessment of the Visual System, Monterey, CA, March 1986. (contributed)

Maurer, D., Lewis, T.L., Tapscott, K., & Brent, H.P. The effect of visual deprivation on form perception. Presented at the Society for Research in Child Development, Toronto, April 1985. (contributed)

Maurer, D., Lewis, T.L., Cavanagh, P., & Anstis, S. A new test of color vision for babies. Presented at the Society for Research in Child Development, Toronto, April 1985. (contributed)

Lewis, T.L., Maurer, D., Warren, J., & Brent, H.P. A comparison of methods for assessing vision in children treated for congenital cataracts. Presented at the Society for Research in Child Development, Toronto, April 1985. (contributed)

Brent, H.P., Arstikaitis, M., Morin, J.D., Lewis, T.L., & Maurer, D. Contact lens management after congenital cataract. Presented at the American Academy of Ophthalmology. Atlanta, November 1984, (contributed) and at Clinical Days 1984, Toronto, November 1984 (invited).

Lewis, T.L., Maurer, D., & Brent, H.P. Optokinetic nystagmus in children treated for bilateral congenital cataract. In R. Groner & C. Menz (Chair), Eye Movements and Psychological Processes. Symposium conducted at the XXIII International Congress of Psychology, Acapulco, September, 1984. (invited)

Lewis, T.L., Maurer, D., & Brent, H.P. Visual resolution in toddlers treated for bilateral congenital cataract. Presented at the meetings of the American Association for Pediatric Ophthalmology and Strabismus, Vancouver, August 1983. (contributed)

Maurer, D., Lewis, T.L., & Tytla, M.E. Contrast sensitivity in children treated for unilateral congenital cataract. Presented at the International Symposium, Development of Visual Functions in Infants and Children, Rotterdam, June 1983. (contributed)

Lewis, T.L., Maurer, D., & Brent, H.P. Visual resolution of infants measured by optokinetic nystagmus. Presented at the International Symposium, Development of Visual Functions in Infants and Children, Rotterdam, June 1983. (contributed)

Maurer, D., & Lewis, T.L. The development of visual fields and optokinetic nystagmus in normal infants and children with congenital cataract. Presented at the International Symposium, Development of Visual Functions in Infants and Children, Rotterdam, June 1983. (contributed)

Lewis, T.L., Maurer, D., & Brent, H.P. An OKN test of visual resolution. Presented at the Society for Research in Child Development, Detroit, April 1983. (contributed)

Brent, H.P., Lewis, T.L., & Maurer, D. Contact lens fitting in aphakic infants. Presented at the Canadian Ophthalmological Society, Toronto, June 1982. (invited)

. Maurer, D., Lewis, T.L., & Milewski, A. The development of nasal field detection in young infants. Presented at the European Conference on Visual Perception, Brighton, England, September 1980. (contributed)

Maurer, D., & Lewis, T.L. The influence of peripheral stimuli on infants' eye movements. Last Whole Earth Eye Movement Conference, St. Petersburg, February 1980. (invited)

Lewis, T.L., & Maurer, D. Newborns' central vision: whole or hole? Presented at the meetings of the Society for Research in Child Development, New Orleans, March 1977. (contributed)

Maurer, D., & Lewis, T.L. What the infant sees from the corner of his eye. Presented at the meetings of the Society for Research in Child Development, New Orleans, March 1977. (contributed)

Maurer, D., Lewis, T.L., Barrera, M., & Kay, D. What the infant sees from the corner of his eye. Presented at the meetings of the Canadian Psychological Association, Toronto, June 1976. (contributed)