The cloudy lens prevents light from proceeding to the retina, resulting in blurred or distorted images. Cataracts are among the most common and treatable eye problems. If untreated, however, a cataract will eventually cause seriously reduced vision. An ophthalmologist is a medical doctor who has graduated from a medical school. An optometrist is an eye care provider who has attended 4 years of college and 4 years of optometry school.
Optometrists primarily prescribe eyeglasses and contact lenses.
However, in some states, optometrists are also allowed to diagnose certain eye conditions and prescribe a limited number of medications. This is variable for different people. If you have no known eye diseases and no ocular complaints, then an annual exam is sufficient. If you are experiencing any eye problems, you should be examined by an ophthalmologist. The frequency of examinations will differ depending on the severity of the condition.