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Retina damage from diabetes. Ophthalmoscope image of diabetic retinopathy in the left eye, where damage to the retina has been caused by diabetes. Red blood vessels are seen emerging from the yellow optic disc (left). The red spots are haemorrhages, blood leaking from blocked capillaries, causing a reduction in blood flow to some areas of the retina. The yellow patches are areas of fatty substances that have leaked from the damaged blood vessels. Here, they are covering the macula (centre), causing macular oedema (swelling). This distorts the central vision and causes a loss of visual acuity (sharpness). Diabetic retinopathy may lead to blindness if left untreated. Blood sugar level maintenance can slow the disease's progress.
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