Breast cancer may affect the eye and orbit by metastatic neoplastic infiltration, uvea being the most common site of presentation. Management of these cases with radiotherapy is usually gratifying with reported response rate of approximately 75%. A retrospective evaluation of cases treated in five Institutions participating in a collaborative radiation therapy group of north-Italy is reported. Fifty-four cases of metastases to the eye or orbit were referred for radiation therapy to the Departments participating in the survey in the period 1977-1995. There were 49 female patients aged between 28 and 75 years (median, 44 years) at presentation of orbital metastasis. Thirty-eight lesions (70%) were metastases to the choroid, 9 involved other parts of the eye, and 7 patients had orbital metastases. Five of the 49 patients had bilateral choroidal metastases. Radiotherapy was employed with megavoltage equipment. The median total dose delivered was 40 Gy (range, 16-60 Gy). All the patients were treated 5 times per week with fraction sizes ranging from 1.8 to 3.0 Gy (median, 2.0 Gy). Of the 43 evaluable eyes, 34 (79%) showed a definite improvement after radiotherapy. There was a stabilization of the process in 4 patients. The rest (11 lesions) were lost to detailed follow-up of the response of the eye metastases. Twelve patients experienced acute transient cheratoconjunctivitis and in a case a subconjunctival haemorrhage was observed; as late side effects, two cases of chataract were observed during a period of observation of 37 and 117 months. A median survival time of 17 months was observed. The goal of irradiation was to improve vision or at least prevent blindness and enucleation. The palliative effect of irradiation was confirmed with a response rate consistent with the data of the literature on this subject.