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Grating visual acuity in infantile nystagmus in the absence of image motion

Dunn, Matt J. ORCID:, Margrain, Tom H. ORCID:, Woodhouse, J. Margaret ORCID:, Ennis, Fergal A. ORCID:, Harris, Christopher M. and Erichsen, Jonathan T. ORCID: 2014. Grating visual acuity in infantile nystagmus in the absence of image motion. Investigative Ophthalmology & Visual Science 55 (4) , pp. 2682-2686. 10.1167/iovs.13-13455

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Purpose: Infantile nystagmus (IN) consists of largely horizontal oscillations of the eyes that usually begin shortly after birth. The condition is almost always associated with lower than normal visual acuity (VA). This is assumed to be at least partially due to motion blur induced by the eye movements. Here, we investigated the effect of image motion on VA. Methods: Grating stimuli were presented, illuminated by either multiple tachistoscopic flashes (0.76 ms) to circumvent retinal image motion, or under constant illumination to subjects with horizontal idiopathic IN and controls. A staircase procedure was used to estimate VA (by judging direction of tilt) under each condition. Orientation-specific effects were investigated by testing gratings oriented about both the horizontal and vertical axes. Results: Nystagmats had poorer VA than controls under both constant and tachistoscopic illumination. Neither group showed a significant difference in VA between illumination conditions. Nystagmats performed worse for vertically-oriented gratings, even under tachistoscopic conditions (p < 0.05), but there was no significant effect of orientation in controls. Conclusions: The fact that VA was not significantly affected by either illumination condition strongly suggests that the eye movements themselves do not significantly degrade VA in adults with IN. Treatments and therapies that seek to modify and/or reduce eye movements may therefore be fundamentally limited in any improvement that can be achieved with respect to VA.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Optometry and Vision Sciences
Publisher: Association for Research in Vision and Ophthalmology
ISSN: 0146-0404
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 16 February 2014
Last Modified: 25 Oct 2022 09:29

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