Ключевые слова: alphabet, background, big, bigger, black, blind, chart, check, concept, correct, equipment, exam, experiment, expertise, eye, eyechart, eyeglasses, eyesight, eyewear, focus, glass, healthcare, human, instrument, large, lens, letter, looking, medical, ophthalmologist, optical, opticians, optometrist, science, scientific, seeing, selective, sight, small, smaller, space, test, text, typescript, vision spectacles, white,