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Relative cone-functional 30-Hz preservation. Full-field electroretinography (ffERG) in patients A-II-2 (62-year-old), B-II:1 (60-year-old), and D-II:5 (49-year-old) with KIZ-related retinitis pigmentosa. FfERG demonstrated that scotopic rod-specific responses and photopic singe-flash responses were extinguished in patients A-II:2 and D-II:5, with diminished amplitudes in patient B-II:1. Maximal ERG and photopic 30-Hz amplitudes were reduced in all the three patients.
