Abstract
Both scotopie ERG and photically evoked potential were simultaneously recorded on 15 cases of optic atrophy, 19 of retinal degenerative disorders and 4 of cataracts. The evoked potentials were recored by Dawson's superimposed meth-od. In optic atrophy the ERG is normal, but the evoked potential is undetectable in cases of total blindness. In retinitis pigmentosa the ERG is undetectable in most cases and the evoked potential also tends to be affected; it either becomes unde-tectable or is decreased in amplitude, but in macular atrophy and in retinochoroidal atrophy both ERG and the evoked potential are normal or slightly affected in spite of deterioration of the visual function. The similar tendency is observed in cataract. Simultaneous recording of ERG and evoked potential is useful supplementary method for topical diagnosis of the involved visual system.
