We retrospectively analyzed the ocular findings after polychemotherapy including intrathecal methotrexate, systemic corticosteroids, and prophylactic cranial irradiation in children with acute lymphoblastic leukemia (n = 16) and non-Hodgkin's lymphoma (n = 2). After a median surveillance time of 4.1 years, asymptomatic ocular abnormalities were observed in 83% of the patients: 7/18 had a decreased tear formation, 5/17 had an opacity of the vitreous body, and 13/18 had an opacity of the lens. It was not possible to determine retrospectively which therapy caused a particular effect. A comparison of the 2 irradiation techniques (with and without blocking of the lacrimal glands) showed that in 5/7 children who developed a reduced eye secretion, the lacrimal glands are within the treatment volume. Therefore, the reduced eye secretion is most likely radiation-induced. Whereas the opacities of the vitreous body were caused by thrombopenia and bleeding during the course of disease, corticoid therapy might have contributed to the lens opacities.