This test is performed by an ophthalmologist or optometrist (eye doctor). You sit in a chair that has a special device (phoroptor or refractor) attached to it, and look through the phoroptor at an eye chart approximately 20 feet away. The phoroptor contains lenses of different strengths that can be moved into view. The eye doctor will ask if the chart appears more or less clear with the lenses that are in place. The eye doctor can determine if you have nearsightedness, farsightedness, astigmatism (asymmetrical cornea), or presbyopia (inability to focus on objects that are close to you). The extent of vision difficulty can be determined. The information obtained from a refraction test helps provide the correct prescription for eyeglasses or contact lenses for each person. It also will determine if you need bifocals. | 
General Eye Care
