Figure 2.

Full-field ERG and multifocal ERG findings in Patient 1 (last visit) and Patient 2 (first and only visit) compared with an age-matched control subject. Abbreviations: DA—dark-adapted; LA—light-adapted; Amp—amplitude; a—a-wave, negative ERG component that arises mostly from photoreceptoral activity; b—b-wave, a positive ERG component originating mostly from bipolar cells; OP2—oscillatory potential, second wave. Arrows indicate reduced (vertical arrow) and delayed (horizontal arrow) full-field ERG responses in Patient 1. Note the reduced mfERG responses in Patient 1 over the whole macular region. The mfERG responses in Patient 2 were reduced, especially in the inner two rings.