Figure 5. Full-field electroretinography (ffERG) and multifocal ERG (mfERG) of patients with GUCA1A mutations. A: Family MTP434 ffERG, no significant alteration of the scotopic responses in III:2 and IV:1, slight decrease of the photopic responses in III:2, and reduction to half the value in IV:1. Family MTP1560 ffERG, normal dim blue scotopic responses and moderate decrease of the bright white scotopic responses in all patients. Dramatic decrease of the photopic responses in all patients, although slightly better in IV:1, and 30-Hz flickers delayed. B: Family MTP434 mfERG, foveal decreased amplitude in IV:1 and normal amplitudes of the outer ring only in IV:3. Family MTP1560 mfERG, highly abnormal responses in IV:1 and in III:2.