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Development and degeneration of retina in rds mutant mice: Light microscopy

Changes during the development and degeneration of the retina in 020/A mice, which are homozygous for the newly reported rds (retinal degeneration slow), gene were studied by histological and enzyme‐histochemical methods with Balb/c mice carrying the normal allele as control. During normal development the total thickness of the retina grows from the time of birth till the age of 21 days and thereafter gradually diminishes, while the thicknesses of the component layers show a characteristic and differential change in course of their histogenesis. In the normal retina the perikarya of the cones are more frequent in the central than in the peripheral areas. The cone frequency in the central retina, but not in the periphery, increases with age and implies selective loss of rod cells in older animals.