refraction test…

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what the risks are normal vision, eye test, refraction, vision test, refraction, refraction test, eye exam that measures a person's ability, an object at a specific distance, this test is performed, ophthalmologist, optometrist, eye doctor, sit, chair that has a special device, phoropter, refractor, attached to it, look, the phoropter at an eye chart approximately 20 feet away, phoropter contains lenses of different strengths, moved into view, eye doctor, ask chart appears more, less clear, the lenses, in place, eye doctor, have nearsightedness, farsightedness, astigmatism, asymmetrical cornea, presbyopia, inability to focus on objects, close to you, extent of vision difficulty, determined, information obtained, a refraction test helps provide the correct prescription, eyeglasses, contact lenses, need bifocals, wear contact lenses, ask the doctor how long they, left out, children, test depends on child's age, level of trust, prepare child, preschooler test, procedure preparation, 3 to 6 years, schoolage test, procedure preparation, 6 to 12 years, adolescent test, procedure preparation, 12 to 18 years, no discomfort, this test, routine eye test, a person has normal vision, a person complains of blurred vision, determine the extent of poor vision, performed to help follow the progress of treatments, the eye, test, prescribe glasses, a normal value is 20/20 vision, perfect vision - able to read 3/8 inch letters at 20 feet, a small type size is also used, normal near vision, myopia, nearsightedness, hyperopia, farsightedness, astigmatism, asymmetrical cornea, presbyopia, inability to focus on near objects that develops, additional conditions under which the test performed, corneal ulcers, infections, macular degeneration, retinal detachment, retinal vessel occlusion, retinitis pigmentosa, no risks, a complete eye examination, done every 3 - 5 years, no problems, vision becomes blurry, worsens, noticeable changes, an eye examination, scheduled, after age 40, a family history of glaucoma, eye examinations, scheduled more frequently to test, glaucoma, anyone, diabetes should have an eye exam at least once a year, refraction problems should have an eye examination every 2 - 3 years.