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Progressive peripheral cone dysfunction
Authors:K G Noble  I M Siegel  R E Carr
Affiliation:Department of Ophthalmology, New York University Medical Center, NY 10016.
Abstract:A 22-year-old man had a three-year history of progressive day blindness, most notably peripherally, and denied difficulty with central vision or color vision. Visual function studies demonstrated a diffuse dysfunction of the photopic system and normal scotopic function. The central cone function, however, was essentially normal. Visual acuity was 20/20 in each eye, results on AO-HRR and Ishihara color plate testing were normal, color naming visual fields demonstrated color discrimination in the central 10 degrees, and foveal adaptation was normal.
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