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    A Limited Role for Suppression in the Central Field of Individuals with Strabismic Amblyopia.

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    Publication date
    2012
    Author
    Barrett, Brendan T.
    Panesar, Gurvinder K.
    Scally, Andy J.
    Pacey, Ian E.
    Keyword
    Strabismic amblyopia
    Suppression
    Central field
    REF 2014
    Rights
    © 2012 Barrett et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
    Peer-Reviewed
    yes
    
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    Abstract
    Background: Although their eyes are pointing in different directions, people with long-standing strabismic amblyopia typically do not experience double-vision or indeed any visual symptoms arising from their condition. It is generally believed that the phenomenon of suppression plays a major role in dealing with the consequences of amblyopia and strabismus, by preventing images from the weaker/deviating eye from reaching conscious awareness. Suppression is thus a highly sophisticated coping mechanism. Although suppression has been studied for over 100 years the literature is equivocal in relation to the extent of the retina that is suppressed, though the method used to investigate suppression is crucial to the outcome. There is growing evidence that some measurement methods lead to artefactual claims that suppression exists when it does not. Methodology/Results: Here we present the results of an experiment conducted with a new method to examine the prevalence, depth and extent of suppression in ten individuals with strabismic amblyopia. Seven subjects (70%) showed no evidence whatsoever for suppression and in the three individuals who did (30%), the depth and extent of suppression was small. Conclusions: Suppression may play a much smaller role in dealing with the negative consequences of strabismic amblyopia than previously thought. Whereas recent claims of this nature have been made only in those with micro-strabismus our results show extremely limited evidence for suppression across the central visual field in strabismic amblyopes more generally. Instead of suppressing the image from the weaker/deviating eye, we suggest the visual system of individuals with strabismic amblyopia may act to maximise the possibilities for binocular co-operation. This is consistent with recent evidence from strabismic and amblyopic individuals that their binocular mechanisms are intact, and that, just as in visual normals, performance with two eyes is better than with the better eye alone in these individuals.
    URI
    http://hdl.handle.net/10454/5672
    Version
    published version paper
    Citation
    Barrett, B. T., Panesar, G. K., Scally, A. J. and Pacey, I. E. (2012). A Limited Role for Suppression in the Central Field of Individuals with Strabismic Amblyopia. PLoS ONE Vol. 7, No. 5, e36611. doi:10.1371/journal.pone.0036611
    Link to publisher’s version
    http://dx.doi.org/10.1371/journal.pone.0036611
    Type
    Article
    Collections
    Life Sciences Publications
    Health Studies Publications

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