Abstract
The clinical and histological examination of a cataract in a man of 47 is described together with a review of the deposition of radionuclides in the eye. It is suggested that the cataract was possibly due, at least in part, to irradiation of the sensitive cells in the germinative zone of the lens epithelium by alpha particles deposited in the pigmented tissues of the eye from the 239Pu circulating in the blood.