Ключевые слова: acuity, astigmatism, bifocal, board, business, busy, character, cleansing, communication, computer, corrective, crystal, device, disguise, distance, drama, electronics, enter, equipment, eyeglasses, eyestrain, glasses, hand, health, horizontal, information, input, internet, job, key, keyboard, keypad, laptop, object, occupation, oculist, office, optics, optometry, people, progressive, push, technology, typeset, typing, using, vision, work, worker, workplace,