Coloured fluorescein angiogram of the back of the eye, showing a retina affected by diabetic retinopathy. The small blood vessels of the eye are particularly prone to damage caused by high blood sugar. Damage to the vessels leads to a lack of oxygen in the retina, which prompts the growth of new, weak blood vessels. These new vessels often bleed into the eye, clouding vision. They can also lead to a detached retina and glaucoma.
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