Figure 17. Persisting depigmented areas, 6 months after exposure, in areas of most severe lesions.” Figure 19. Section of skin from beta-burn area on back of neck of 56-vear-old woman (No. 34) at 10 years after exposure (100). Note atrophy of epidermis with narrowing of stratum granulosum and fingerlike projections of rete pegs. Slight atrophy of the sweat gland ductsis also present.!! Figure 18. Ear lesion healed, 6 months after exposure, with considerable scarring.” Figure 20. Pigmented nevuslike lesions in previous beta-burn area of neck (subject No. 78).11 the neck regions that sustained severe beta burns suggests that the developmentof benign lesions may and unexposed populations. In addition,special examinationsfor possible effects of radiation on the eyes have been doneat intervals by ophthalmologists accompanying the medical team,first in have been enhanced by the skin exposure (see Fig- ure 20). Possible cocarcinogenic factors such as the ultraviolet radiation in tropical sunlight and skin irritation from coral, trauma, and infections may render the developmentof malignant changes in the skin morelikely, but the dark pigmentation should offer some protection, as it has been shown that skin canceris less prevalent among Negroes. E. OPHTHALMOLOGICAL FINDINGS Routine ophthalmological examinations(including funduscopic) have beenincluded in the regular physical examinations of both the exposed May 1954 (2 monthsafter the accident) and then in 1955, 1956, 1957, 1958, 1959, 1962, 1964, 1967, 1971, and 1972. The routine examinations include testing of vision, accommodation, muscle balance, and pupillary reactions; external examination; and funduscopy. Vision is tested with the Snellen chart and the E-chart when necessary. Intraocular tension has been measured when indicated, and color vision has been tested on several occasions. Special examinations have includedslit-lamp and fundus photography. As partof the aging studies quantitative changesin certain eye characteristics