This second edition is substantially expanded, with broader and deeper coverage. Includes new chapters on the focal and multifocal electroretinogram and the pattern ERG. Also covers visual evoked potential, pattern dystrophies, North Carolina macular dystrophy, progressive bifocal macular dystrophy, sheen retinal dystrophies, neuronal ceroid lipofuscionoses, retinal degeneration with spinocerebellar ataxia, enhanced S-cone syndrome, and more.