This paper describes the clinical process of 4 persons exposed to an atomic bomb near the explosion in Nagasaki who have received chemotherapy because of incipient senile cataracta associated by cataracta due to an atomic bomb. The dropping of Catalin and Tathion in the eyes, oral administration of Thiola, and injection of Glutathione were done. Dramatic results were not obtained. However, when the administration was done at the time of slight corneal opacity, it did not developed. Therefore, it can't be denied now that the chemotherapy is effective.