nearsightedness

A new study strongly indicates that the primary cause of nearsightedness is heredity. The study also suggests that the amount of time a child spends studying or reading plays a minor role in the development of myopia, or nearsightedness. The researchers found that, per week, myopic children spent more time studying and reading for pleasure and less time playing sports than non-myopic children. Myopic children also scored higher on a test of basic reading and language skills than did children with normal vision.