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Copyright © 2012 American Academy of Optometry ORIGINAL ARTICLE Torsional Anomalous Retinal Correspondence Effectively Expands the Visual Field
BibTeX
@MISC{Hemianopia_copyright©,
author = {In Hemianopia and Hini Satgunam and Eli Peli},
title = {Copyright © 2012 American Academy of Optometry ORIGINAL ARTICLE Torsional Anomalous Retinal Correspondence Effectively Expands the Visual Field},
year = {}
}
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Abstract
Purpose. Exotropia in congenital homonymous hemianopia has been reported to provide field expansion that is more useful when accompanied with harmonious anomalous retinal correspondence (HARC). Torsional strabismus with HARC provides a similar functional advantage. In a subject with hemianopia demonstrating a field expansion consistent with torsion, we documented torsional strabismus and torsional HARC. Methods. Monocular visual fields under binocular fixation conditions were plotted using a custom dichoptic visual field perimeter. The dichoptic visual field was also modified to measure perceived visual directions under dissociated and associated conditions across the central 50 ° diameter field. The field expansion and retinal correspondence of a subject with torsional strabismus (along with exotropia and right hypertropia) with congenital homonymous hemianopia was compared with that of another exotropic subject with acquired homonymous hemianopia without torsion and to a control subject with minimal phoria. Torsional rotations of the eyes were calculated from fundus photographs and perimetry. Results. Torsional anomalous retinal correspondence documented in the subject with congenital homonymous hemianopia provided a functional binocular field expansion up to 18°. Normal retinal correspondence was mapped for the full 50 ° visual field in the control subject and for the seeing field of the acquired homonymous hemianopia subject, limiting the functional field expansion benefit.
Keyphrases
visual field torsional strabismus american academy congenital homonymous hemianopia field expansion control subject diameter field homonymous hemianopia subject exotropic subject right hypertropia harmonious anomalous retinal correspondence field expansion consistent torsional harc similar functional advantage custom dichoptic visual field perimeter binocular fixation condition normal retinal correspondence fundus photograph minimal phoria dichoptic visual field retinal correspondence torsional anomalous retinal correspondence monocular visual field visual direction functional field expansion benefit homonymous hemianopia functional binocular field expansion torsional rotation
