Ключевые слова: acuity, astigmatism, background, bifocal, black, chart, closeup, concept, conceptual, corrective, crystal, distance, exam, examination, eye, eyeglasses, eyesight, eyestrain, farsightedness, frame, glasses, horn, lens, longsightedness, looking, medicine, myopia, myopic, nearsightedness, object, oculist, ophthalmologist, ophthalmology, optical, optician, optics, optotypes, plastic, read, rimmed, see, seniors, short, sight, snellen, spectacles, test, vision, visual, white,