If you have diabetes, your body does not use and store glucose properly. High blood sugar levels can damage blood vessels in the retina, the nerve layer at the back of the eye that senses light and helps to send images to the brain. The damage to retinal vessels, referred to as a diabetic retinopathy, can cause bleeding at the back of the eye and vision problems.
If you have diabetes, it is important to schedule an examination at least once per year. More frequent examinations may be necessary, depending o the progress of the disease.