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SUMMARY A case of radiation induced retinopathy with neovascularisation arising from the optic disc and retina was treated with panretinal argon laser photocoagulation. Complete regression of the new vessels was observed within 2 weeks of therapy. The pathogenesis of neovascularisation in this condition is discussed. Radiation retinopathy was first described in 1935' and consists of microaneurysms, retinal hacmorrhages, cotton-wool patches, perivascular sheathing, exudates, cystoid macular oedema, and new vessels arising from both the optic disc and the retina.2-'0 Optic atrophy and central retinal artery occlusion appeared. there is very little information on the successful treatment of the neovascularisation frequently encountered in this condition. Two cases of radiation retinopathy have been described in which macular oedema was treated by focal light coagulation.8 0o We report here a case of radiation retinopathy in which optic disc and retinal new vessels were treated successfully with argon laser photocoagulation. We believe this is the first reported case of radiation retinopathy in which optic disc and retinal neovascularisation has regressed after panretinal argon laser photocoagulation. 623 on 11 May 2018 by guest. Protected by copyright.