This brief article will tell you. However, only an ophthalmologist, who has been to medical school and served an internship, is qualified to treat cataracts. During an examination, the eye professional is able to observe cloudy areas on the lenses, even before the cataracts begin to interfere with vision.
Cameras can measure the cataract density.
Various vision tests are performed. To determine how clearly a person can actually see, the familiar Snellen eye chart is used, with its rows of letters of decreasing sizes. From a specified distance, usually 20 feet, a person reads the letters using one eye at a time. If the large letters on the line marked 200-feet cannot be read with the better eye, even with glasses, the patient is considered legally blind. Other tests are also sometimes used to determine vision problems.