An ophthalmologist specializes in vision and eye care. S/he is licensed to practice medicine and surgery and has completed college as well as undergone eight additional years of medical training. An optometrist provides primary vision care and is licensed to test, diagnose, correct, treat, and manage vision changes. S/he completes at least three years of college followed by four years of optometry school. Opticians are authorized to design, verify, and fit contact lenses, eyeglass lenses and frames, and other devices to correct eyesight. Opticians do not test vision or issue prescriptions but rely on prescriptions supplied by optometrists or ophthalmologists.