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Flash electroretinogram (ERG) from 1993 and 2013. (A) Right/left eye (1993): reduced scotopic (Stäbchen) and photopic (Zapfen) ERG responses in the right eye (Rechts), normal ERG responses in the left eye (Links). (B) Right eye (2013): extinguished scotopic and photopic ERG responses; left eye (2013): regular responses with normal amplitudes in the scotopic and photopic ERG.
