Primate myopia.

Studies dealing with the development of myopia in primates are considered as they contribute to our understanding of myopia. Myopia appears to develop in two stages. The first is a lenticular change in eyes which have been focused at nearpoint for long periods; the lens remains continuously accommodated. Since accommodation in monkeys results in an increase in vitreous chamber pressure, a comparable increase in children could induce the second stage--an increase in the size of the vitreous chamber and a corresponding increase in axial length or true myopia. Behavior and personality appear to be related to myopia.