Convergence accommodation trumps accommodative convergence

Horwood, A. ORCID: https://orcid.org/0000-0003-0886-9686, Riddell, P. ORCID: https://orcid.org/0000-0002-4916-2057 and Toor, S. (2012) Convergence accommodation trumps accommodative convergence. In: 35th European Strabismological Association Conference, 3-5 Sep 2012, Bucharest, Romania, pp. 137-141.

Abstract/Summary

Purpose. This symposium contribution presents research that shows that disparity cues within a near stimulus drive not only vergence but also most of the accommodation. Be-cause blur is a weaker cue, accommodative convergence is therefore only of minor significance for most individuals. Methods. The Infant Vision Laboratory at the University of Reading uses a Power Ref II photorefractor to collect simultaneous accommodation and convergence data from participants fixating targets moving in depth. By manipulating target characteristics, we have been able to test how blur, disparity and proximal cues each contribute to driving responses. Results. Results from a series of studies over the past 12 years have contributed to a coherent body of evidence suggesting that disparity cues override blur and proximity cues in most individuals. Some strabismic patients do use blur as a more strongly weighted cue, and this strategy could contribute to their symptoms, clinical characteristics and response to treatment. Conclusion. Although convergence accommodation is extremely difficult to measure clinically, clinicians should be aware of its importance in binocular vision and strabismus. Although CA/C relationships typically seem more important than AC/A, bo th only partly explain the interplay between convergence and accommodation.

Item Type	Conference or Workshop Item (Paper)
URI	https://reading-clone.eprints-hosting.org/id/eprint/31390
Item Type	Conference or Workshop Item
Refereed	Yes
Divisions	Life Sciences > School of Psychology and Clinical Language Sciences > Department of Psychology Life Sciences > School of Psychology and Clinical Language Sciences > Development Life Sciences > School of Psychology and Clinical Language Sciences > Perception and Action
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