Four Years of Annual Studies of Chimpanzee Vision

Four annual studies of the visual ocular components of approximately 40 male and 40 female chimpanzees are summarized and discussed. In general, ocular changes over the five-year span are similar to those found in human subjects under similar conditions except for changes in the corneas, which show changes not usually found in humans. Approximately a third of the subjects show increased axial lengths and myopia. Females show higher levels of myopia than males.