Ключевые слова: alphabet, astigmatism, background, beauty, blind, care, chart, clinic, closeup, concepts, defocused, diagnostic, equipment, exam, examining, experiment, eyesight, glass, glasses, health, hospital, human, image, instrument, isolated, landolt ring, lens, letter, looking, medical, nobody, object, objects, ophtalmologist, ophthalmological clinic, ophthalmology, optical, optometrist, optometry, reading, science, scientific, table, test, text, typescript, view, vision,