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primary intraocular lymphoma cavernous haemangioma capillary haemangioma retinal astrocytoma optic disc melanocytoma choroidal naevus medulloepithelioma melanocytosis ciliary body melanoma iris cyst melanocytoma choroidal melanoma retinoblastoma iris freckle iris naevus magnitude of blindness prime minister鈥檚 -20 point programme npcb definition of blindness types of blindness guidelines in india vision 2020 school eye screening programme dbcs district blindness control society national programme for control of blindness macula optic disc eye retina normal fundus ophthalmology fundoscopy direct ophthalmoscope