It is strongly recommended that diabetic patients get a comprehensive eye exam each year. Diabetes can affect many parts of the eye including changes in vision, cataracts, glaucoma, paralysis of the nerves that control the eye muscles or pupil, and decreased corneal sensitivity. Some visual symptoms of diabetes includes blurry vision, occasional double vision, loss of peripheral vision, and flashes and floaters within the eyes. Sometimes these early signs of diabetes are first detected in a thorough eye examination performed by a doctor of optometry. OHIP covers a yearly comprehensive eye exam for all diabetic patients.