Over time, too much sugar in your blood can block tiny blood vessels of the retina, cutting off its blood supply.
As a result, new vessels grow, but they are fragile and eventually leaks leading to diabetic retinopathy.
There are two types of diabetic retinopathy:
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Early diabetic retinopathy. In this more common form — called nonproliferative diabetic retinopathy (NPDR) — new blood vessels aren't growing (proliferating).
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Advanced diabetic retinopathy-more severe type, known as proliferative diabetic retinopathy in which newly formed blood vessels leak.