Ключевые слова: astigmatism, background, black, blur, care, chart, check, clinic, concept, cornea, correction, diagnostic, disease, exam, eye, eye doctor, eyeglass, eyesight, face, focus, frame, glass, goggles, gold, half, health, healthcare, human, lens, letter, look, man, medical, minus, myopia, optic, optical, optometry, patient, plus, protection, read, see, sight, test, up, vision, visual, white, yellow, zoom,