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This small, handsome monograph summarizes the senior author's experience with the topic from unpublished beginnings in 1941 to recent results obtained with a standardized technique available in his laboratory since 1968. Not quite half of the text is devoted to the electroretinogram (ERG); the balance is about evenly divided among the electro-oculogram (EOG), visual evoked response (VER), and experimental studies using rabbits. Almost two thirds of the material concerns primary clinical observations and case reports. Useful observations are strewn throughout the book, like the age-dependent amplitude of components of the ERG (p 19), but a systematic, analytic approach is missing. An unusual pedigree is reported extending over six generations and showing an autosomal dominant retinitis pigmentosa concurrent with stationary night blindness of the Nougaret type (p 46). The EOG findings detail changes of the base potential as well as the light-induced potential. The EOG was found to be pathologic in