25 eral observation that the Marshallese age faster than Americans. The incidence was higher in the exposed group (36%) than in the unexposed group (19%). However,-recent analvsis of aging criteria did not show anysignificant differences between exposed and unexposed groups. Though diabetes mellitus has a moderately high incidence in the Marshall Islanders, only one case of diabetic retinopathy was noted. This is in keeping with the observation that the onsetof diabetes in the Marshallese occurs largely in older individuals. The incidence of pinguecula and pterygium is high in the Marshall Islands, and also slightly higher in the exposed group than in the unexposed (see Table 16). It has been postulated that the higher incidence in the exposed group maybe related to contamination of the conjunctival sac with fallout material at the time of the accident. The incidence of abnormalities of the crystalline lens is greater in the Marshall Islanders than in similar age groups in the United Scates. Further- more, the incidence of such abnormalities was Tabie lo Ophthaimological Survev, 1964 Exposed No. My Number examined 68 Anisocoria Anterior staphyloma Arcus senilis Argyll Roberton pupil Chalazion Choroiditis (old, healed with scars) Conjunctivitis Corneal pigment Corneal scar Driisen Duane’s syndrome Lens: Polychromatic sheen Opacities & cataract: presenile senile 1 l 25 I 1.40 1.40 36.70 1.40 3 1 2 3 1 4.20 1.40 2.80 4.20 1.40 18 1 12 26.50 1.40 17.60 1 1 1,40 1.40 Aphakia Leprosy, eve signs of Macuiar degeneration Molluscum contagiosum Melanomaofiris Melanomaof conjunctiva Nystagmus Pinguecula Pterygium Proptosis Phthisis bulbi Positive Rhomberg Retinal arteriosclercsis Retinal scars Retinal hemorrhage Strabismus: Internal External Seventh nerve weakness Vitreous opacities 2 Children of exposed No. % 45 1.40 11 20 16.20 29.40 1 4 2 l 1.40 6.00 2.80 1.40 3 7.30 No. l 0.52 37 19.46 2 3 .05 1.37 2 1.05 1 41 3 25 0.52 21.37 1.37 10.64 \ 2 1 2 0.52 1.05 0.52 1.05 2 17 38 1.05 8.44 19.98 1 \ 9 5 0.52 9.52 +.68 2.60 L 2 1 3 0.52 1.05 0.52 1.37 l 1 1 % 190 2.80 1 Controls 2.2 0.52 0.52