If you have Glaucoma and have already lost vision in one eye due to long-standing high blood sugar, it is important to understand that vision loss from damage to the eye nerve or retina is usually permanent and cannot be brought back with medicines or surgery. Treatments in this situation are mainly aimed at protecting the remaining vision and preventing further damage. Your doctor may prescribe eye drops to control eye pressure (for glaucoma) and advise strict control of blood sugar, blood pressure, and cholesterol to protect the other eye. Regular eye check-ups are very important so that any changes can be detected early. If you have reduced vision, low-vision aids like special glasses, magnifiers, or proper lighting can help improve day-to-day functioning. While it may not be possible to restore lost vision, careful management and follow-up can help you maintain the vision you still have and improve your quality of life.