SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Retina damage from diabetes. Ophthalmoscope image of diabetic retinopathy, where severe damage to the retina has been caused by diabetes. Red blood vessels are seen emerging from the optic disc (right). The red patches 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), a region of the eye needed for 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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