Ключевые слова: adult, astigmatism, background, bad, book, care, caucasian, device, eye, eyeglasses, eyes, eyesight, eyestrain, fatigue, female, focus, girl, glasses, hand, headache, health, holding, home, illness, isolated, lady, loss, myopia, pain, people, person, poor, portrait, problem, read, sad, screen, selective focus, sight, strain, student, studio, tired, trouble, upset, vision, visual, white, woman, young,