Heterochromia following intravitreal chemotherapy in two cases.

Intravitreal chemotherapy is recognized as an effective treatment for retinoblastoma with vitreous (and occasionally subretinal) seeding refractory to intravenous or intra-arterial chemotherapy. However, this treatment carries with it the risk of toxicity to both the posterior and anterior segments of the eye, including retinal pigment epithelial mottling, ischemic/hemorrhagic retinopathy, posterior synechia, cataract, scleral necrosis, and focal iris depigmentation. We report 2 cases of iris heterochromia secondary to profound iris stromal depigmentation following intravitreal melphalan and topotecan injections.