15 patients with kidney transplants were followed up for a period of 3 to 45 months. All but one developed lenticular opacities in the posterior subsapsular region. The opacities were classified according to their severity. It could be shown that the cataract index was correlated to the total amount of corticosteroids given. There is probably an additional effect of age and azathioprin therapy. Possibly, the time of treatment with intermittent hemodialysis also influences cataract development.