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Full-field electroretinograms (ERGs). (a) and (b) ERG of both patient II-2 (a) and patient III-1 (b) in family 1 shows diminished amplitudes of the rod, standard combined, cone, and 30-Hz flicker responses. (c) ERG of patient II-1 in family 2 is nonrecordable for the rod, standard combined and 30-Hz flicker responses.
