Ключевые слова: acuity, astigmatism, background, black, blurry, chart, closeup, concept, conceptual, corrective, diagnostic, doctor, exam, eye, eyeglasses, eyes, eyesight, focus, frame, glasses, health, isolated, lens, lenses, letters, medical, medicine, myopia, object, ophthalmology, optical, optometrist, optometry, plastic, read, reading, see, senior, shallow, short, sight, spectacles, test, vision, visual, white,