Bull's eye maculopathy with early cone degeneration.

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Abstract
Patients (7) with acquired cone degeneration were investigated. The initial visual acuities in 6 of the series were normal or near normal but later deteriorated, although they did not fall below 6/60 in any patient. All the patients tested had color vision defects and abnormalities on electrodiagnostic testing [electro-oculography, electroretinography, critical flicker fusion and visual evoked response] referable to the cone system. The typical picture was of a bull''s eye maculopathy accompanied by an annular scotoma around the fovea, but the clinical and electrophysiological investigations showed that there were considerable variations especially in the early stages.

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