Ключевые слова: care, chart, check, checkup, conceptual, diagnosis, distortion, exam, examination, eye, eye chart, eyeglass, eyesight, focus, glasses, health, lenses, letters, magnify, medical, ophthalmologist, ophthalmology, optical, optician, optics, optometrist, optometry, read, scale, see, sight, snellen, spectacles, test, vision, vision chart,