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Infant Vision$
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François Vital-Durand, Janette Atkinson, and Oliver J. Braddick

Print publication date: 1996

Print ISBN-13: 9780198523161

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780198523161.001.0001

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Dioptric blur, grating visual acuity, and stereoacuity in infants

Dioptric blur, grating visual acuity, and stereoacuity in infants

(p.275) 18 Dioptric blur, grating visual acuity, and stereoacuity in infants
Infant Vision

Paulette P. Schmidt

Ivan C. J. Wood

Sarah Lewin

Helen Davis

Oxford University Press

In the assessment of visual function, visual and stereo acuity measurement play important roles in diagnosing vision problems and in monitoring the effects of clinical treatments. Grating-acuity measurement determined by preferential-looking methods is the most widely available tool for assessment of visual function in infants and toddlers. Visual acuity may be measured binocularly and monocularly but requires monocular measurements to determine the presence of unilateral blur. Stereo acuity is the perception of depth as a consequence of cortical recognition of horizontal retinal disparity between the two eyes. It is a form of hyper acuity and is measured binocularly. Stereopsis is the result of activating cortical binocular cells with identical but disparate images. Disrupted or discordant binocular vision during human infancy results in amblyopia and/or suppression thereby interrupting stereopsis. The development of stereopsis has important implications for both understanding human visual development and the clinical treatment of visual anomalies.

Keywords:   dioptrie blur, grating visual acuity, stereo acuity, preferential-looking methods, horizontal retinal disparity, hyper acuity

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