Flashes of light are caused by tension between the vitreous gel in the eye and the retina. As the gel pulls on the retina, the retina is stimulated, sending signals to the brain that are interpreted as flashes of light.
If you have diabetes mellitus, your body does not use sugar properly. High blood-sugar levels can damage blood vessels in the retina. This is called diabetic retinopathy. There are two major types of diabetic retinopathy: non proliferative diabetic retinopathy (NPDR) and proliferative diabetic retinopathy (PDR). Many diabetics have mild NPDR.
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