NDLI: Peripheral vision of youths with low vision: motion perception, crowding, and visual search.

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Peripheral vision of youths with low vision: motion perception, crowding, and visual search.

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Peripheral vision of youths with low vision: motion perception, crowding, and visual search.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Lusk, Kelly E. Corn, Anne L. Lappin, Joseph S. Nyquist, Jeffrey B. Tadin, Duje
Description	Country affiliation: United States Author Affiliation: Tadin D ( Center for Visual Science, Department of Brain and Cognitive Sciences, University of Rochester, Rochester, New York 14627, USA. duje@cvs.rochester.edu)
Abstract	PURPOSE: Effects of low vision on peripheral visual function are poorly understood, especially in children whose visual skills are still developing. The aim of this study was to measure both central and peripheral visual functions in youths with typical and low vision. Of specific interest was the extent to which measures of foveal function predict performance of peripheral tasks. METHODS: We assessed central and peripheral visual functions in youths with typical vision (n = 7, ages 10-17) and low vision (n = 24, ages 9-18). Experimental measures used both static and moving stimuli and included visual crowding, visual search, motion acuity, motion direction discrimination, and multitarget motion comparison. RESULTS: In most tasks, visual function was impaired in youths with low vision. Substantial differences, however, were found both between participant groups and, importantly, across different tasks within participant groups. Foveal visual acuity was a modest predictor of peripheral form vision and motion sensitivity in either the central or peripheral field. Despite exhibiting normal motion discriminations in fovea, motion sensitivity of youths with low vision deteriorated in the periphery. This contrasted with typically sighted participants, who showed improved motion sensitivity with increasing eccentricity. Visual search was greatly impaired in youths with low vision. CONCLUSIONS: Our results reveal a complex pattern of visual deficits in peripheral vision and indicate a significant role of attentional mechanisms in observed impairments. These deficits were not adequately captured by measures of foveal function, arguing for the importance of independently assessing peripheral visual function.
ISSN	01460404
e-ISSN	15525783
DOI	10.1167/iovs.12-10350
Journal	Investigative Opthalmology & Visual Science
Issue Number	9
Volume Number	53
Language	English
Publisher	Association for Research in Vision and Ophthalmology
Publisher Date	2012-08-24
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Motion Perception Physiology Perceptual Disorders Physiopathology Vision, Low Visual Acuity Visual Fields Adolescent Vision Tests Vision, Ocular Visual Field Tests Research Support, N.i.h., Extramural Discipline Ophthalmology
Content Type	Text
Resource Type	Article
Subject	Ophthalmology Sensory Systems Cellular and Molecular Neuroscience

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