23 Figure 19. Section ofskin from beta-burn area on back of Figure 17. Persisting depigmented areas, 6 months after exposure, in areas of mostseverelesions.* neck of 56-year-old woman (No. 34) at 10 years after exposure (100 x}. Note atrophy of epidermis with narrowing of stratum granulosum and fingerlike projections of rete pegs. Slight atrophy of the sweat gland ductsis also z € en. kd deme Len. v 1 ~ eee ee eS present.?! f Figure 18. Ear lesion healed, 6 months Figure 20. Pigmented nevuslike lesions in previous the neck regions that sustained severe beta burns suggests that the developmentofbenign 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 May 1954 (2 monthsafter the accident) and then in 1955, 1956, 1957, 1958, 1959, 1962, 1964, 1967, after exposure, with considerable scarring.” have been enhanced bythe 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 malignantchanges in the skin morelikely, but the dark pigmentation should offer some protection, as it has been shown that skin cancer is less prevalent among Negroes. E. OPHTHALMOLOGICAL FINDINGS Routine ophthalmological examinations (including funduscopic) have been included in the regular physical examinations of both the exposed beta-burn area of neck (subject No. 78). 1971, and 1972. The routine examinations include testing of vision, accommodation, muscle balance, and pupillary reactions; external examination; and funduscopy. Vision ts 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 severaloccasions. Special examinations have includedslit-lamp and fundus photography. As part of the aging studies quantitative changesin certain eye characteristics