[Lesson2] Designs for Hope and Change [능률교육 고등학교 영어1(High School English1] 3차시(p52) See Better to Learn Better Eyesight problems cause learning difficulties, as they make it hard for students to see the writing on the board or read textbooks. In Mexico, it is estimated that up to 70% of the students in some schools need glasses. However, many poor families could not afford glasses for their chil..