Ключевые слова: astigmatism, bad, blind, book, boy, close, college, difficult, education, exam, eye, eyeglasses, eyesight, fatigue, glasses, guy, hard, health, homework, knowledge, learn, library, loss, man, myopia, myopic, nearsighted, overload, overloaded, overworked, people, person, poor, presbyopia, problem, read, sad, school, see, sight, strain, student, study, syndrome, textbook, tired, trouble, university, vision, young,