Figure 4. Electroretinograms of all cases. Bottom row: Electroretinograms (ERGs) of a control subject. No significant interocular asymmetry was present and data are only shown from one eye of each patient. DA 0.01: dark-adapted 0.01 cd.s.m⁻²; DA 11.0: dark-adapted 11.0 cd.s.m⁻²; LA 30 Hz: light-adapted 3.0 cd.s.m⁻², 30 Hz flicker; LA 3.0: light-adapted 3.0 cd.s.m⁻²; PERG: pattern ERG.