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Spatial judgments in patients with retinitis pigmentosa |
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| Authors: | Wittich Walter Faubert Jocelyn Watanabe Donald H Kapusta Michael A Overbury Olga |
| Affiliation: | a Centre de recherche institut universitaire de gériatrie de Montréal, 4565, Chemin Queen-Mary, Montréal, Québec, Canada H3W 1W5 b MAB-Mackay Rehabilitation Centre, 7000 Sherbrooke Street West, Montreal, Quebec, Canada H4B 1R3 c School of Optometry, University of Montreal, Case postale 6128, succursale Centre-Ville, Montreal, Quebec, Canada H3C 3J7 d Department of Ophthalmology, SMBD Jewish General Hospital, McGill University, 3755, chemin de la Cote-Sainte-Catherine, Montréal, Québec, Canada H3T 1E2 e Centre de recherche interdisciplinaire en réadaptation du Montréal métropolitain, 2275, Laurier Avenue East, Montreal, Quebec, Canada H2N 2N8 |
| Abstract: | Previous investigations into cortical plasticity in the presence of ocular disease have focused on central retinal damage. Perceptually, patients often report distortions of visual space which can be partially explained by perceptual filling-in. The mechanisms involved could also apply to peripheral field loss. Spatial interval discrimination was tested in 28 retinitis pigmentosa (RP) patients and a control group. When stimuli were presented to both hemispheres, bias did not differ whereas threshold was poorer in RP patients. When presenting the task to only one hemifield, bias was related to field asymmetry, but only in the left visual field, r2 = .59. Brain laterality may be an important factor when examining changes in cortical function in response to peripheral system damage. |
| Keywords: | Applied psychophysics Spatial interval discrimination Retinitis pigmentosa Spatial vision Visual distortion |
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