While many online eye tests help patients gauge problems with their eyesight, they must see an ophthalmologist or other licensed professional for a diagnosis, states Sterling Optical. Common conditions patients can perform a preliminary test for include myopia, farsightedness, nearsightedness and astigmatism, according to Essilor.
People who need new contacts and glasses to deal with vision changes can see an optometrist. These professionals are licensed to prescribe corrective lenses and can prescribe certain medications. For people with eye problems and diseases, they must seek treatment from an ophthalmologist, states the American Association for Pediatric Ophthalmology and Strabismus. These professionals are doctors who have received eight years of training outside of college, and they practice medicine and surgery. Ophthalmologists also prescribe corrective vision lenses.