Radiotherapy of superficial neoplasms and protoneoplasms arising in or on the ocular conjunctiva, while often effective, poses certain technical problems associated with the protection of sensitive structures within the eye and limiting the radiation to only the diseased part. Treatment of these lesions by radiotherapy should satisfy the following conditions: (a) It must enable delivery of a high dose of irradiation to the tumor within a reasonable time. (b) Treatment should lend itself to protraction and fractionation if desired. (c) The dose should be uniform over an irregular surface, i.e., when both palpebral and bulbar conjunctivae are involved. (d) The irradiation should be confined to the tumor-bearing part and normal tissues about it. That is, the lens, uveal tract, iris, and cornea beneath, the lids above, and the normal conjunctiva about must be protected from the irradiation. (e) Procedure should be well tolerated by the patient. A technic which seems to satisfy these conditions and which has b...