Normal adult hemoglobin A molecule comprises two α and two β globin chains associated with a heme ring. Mutation at the 6th position of the beta chain is the cause of<unk> <unk>  disease. Due to<unk> <unk>  disease, vascular occlusion may occur in the conjunctiva, iris, retina, or choroid. Retinal changes occur due to blockage of retinal blood vessels by abnormal RBCs.
Sickle cell retinopathy
Autoimmune retinopathy
Diabetic retinopathy
Hypertensive retinopathy
Radiation retinopathy
Chloroquine retinopathy
Photic retinopathy
Autoimmune optic neuropathy