A comprehensive eye examination evaluates how well you see but also can identify any potential eye diseases. Some of these diseases, such as glaucoma and macular degeneration, can result in serious vision loss if not detected and treated early. Often patients with these diseases don’t experience any visual symptoms before vision loss occurs. If you are over 35, you should have a comprehensive eye examination every two years. Patients over 65 or with a family history of glaucoma, diabetes or diabetic retinopathy should have a yearly exam.