Objective: To describe a previously unreported electroretinographic (ERG) pattern in early retinitis pigmentosa (RP). Design: Two case reports. Participants: Two unrelated young asymptomatic patients with autosomal- dominant retinitis pigmentosa were studied. Main Outcome Measures: Clinical findings and ERG responses were assessed. Results: No ERG responses were detected scotopically with low-luminance stimuli. With increasingly brighter stimuli, a series of three to five low-frequency damped wavelets developed under both scotopic and photopic conditions. The period of the wavelets was 25 to 37 msec. Conclusions: Low-frequency damped ERG wavelets occur in some young asymptomatic patients with autosomal-dominant RP. The ERG pattern suggests that these wavelets are predominantly cone-generated.
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