Retinal occlusion. Ophthalmoscope view of a retina showing damage caused by retinal blood vessel thrombosis, the blockage of a blood vessel by an abnormal blood clot (thrombus). The retina is the light sensitive membrane at the back of the eye. At upper right is the optic disc (yellow), where the blood vessels enter the eye. The dark patch at lower left is damage to the retina due to the blocked blood vessel. Extensive damage such as this can lead to blindness. Abnormal blood clotting can be treated with anticoagulant drugs, but the damage to the retina is permanent.
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