This document discusses how diabetes can damage the retina and cause vision loss or blindness. It explains that excess blood glucose in diabetes can destroy the retina by damaging the tiny blood vessels that supply it with nutrients and oxygen. Over time, this causes various changes in the retina like microaneurysms, leaking of fluids, and growth of abnormal new blood vessels which can lead to vision impairment or loss. Regular screening through tests like retinal photography and OCT scans can detect early signs of retinopathy so it can be treated before permanent vision damage occurs. Laser therapy, anti-VEGF injections, and vitrectomy surgery may help treat retinopathic changes and prevent further vision loss, but keeping blood sugar well-controlled is key