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Visual backward masking performance in young adult emmetropes and myopes

Kuo, Hui-Ying , Schmid, Katrina L., & Atchison, David A. (2012) Visual backward masking performance in young adult emmetropes and myopes. Optometry and Vision Science, 89(1), E90-E96.

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Abstract

Purpose. To investigate how temporal processing is altered in myopia and during myopic progression.

Methods. In backward visual masking, a target's visibility is reduced by a mask presented quickly after the target. Thirty emmetropes, 40 low myopes, and 22 high myopes aged 18 to 26 years completed location and resolution masking tasks. The location task examined the ability to detect letters with low contrast and large stimulus size. The resolution task involved identifying a small letter and tested resolution and color discrimination. Target and mask stimuli were presented at nine short interstimulus intervals (12 to 259 ms) and at 1000 ms (long interstimulus interval condition).

Results. In comparison with emmetropes, myopes had reduced ability in both locating and identifying briefly presented stimuli but were more affected by backward masking for a low contrast location task than for a resolution task. Performances of low and high myopes, as well as stable and progressing myopes, were similar for both masking tasks. Task performance was not correlated with myopia magnitude.

Conclusions. Myopes were more affected than emmetropes by masking stimuli for the location task. This was not affected by magnitude or progression rate of myopia, suggesting that myopes have the propensity for poor performance in locating briefly presented low contrast objects at an early stage of myopia development.

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ID Code: 49333
Item Type: Journal Article
DOI: 10.1097/OPX.0b013e31823733e6
ISSN: 1040-5488
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2012 Lippincott Williams & Wilkins
Deposited On: 23 Mar 2012 15:56
Last Modified: 22 Apr 2013 22:23

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