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The Basic Eye Exam
Your eye care provider takes medical information to begin an examination. During the examination, visual acuity and refraction are accessed. A refraction test helps to determine the extent of a patient's refractive error (nearsightedness, farsightedness, astigmatism) as well as the proper prescription for eyeglasses or contact lenses.
The patient's eyes are looking through an instrument called a Phoropter, which resembles a very large pair of binoculars. Lenses with dioptric power are placed before the eyes until the patient sees as clearly as possible. This final combination of lenses determines the patient's prescription. |