"By using a hood to restrict the vision of monkeys so that they could not see more than fifteen inches (38 cm) from the eye, it was found that most of them develop myopia after a few months' time, just as humans do. Monkeys living in the wild, on the other hand, do not develop myopia."
"Numerous researchers have found a higher incidence of myopia in girls than in boys. Heredity need not be the reason for this. It can be explained by the fact that boys have traditionally spent more time in outdoor sports activities while girls have more frequently turned to sewing, knitting and other close-work activities.""At one time, most of the lenses produced by optical companies were plus lenses to correct hyperopia or presbyopia. Minus lenses to correct myopia made up only a small percentage of their production. Now this situation has reversed, and far more minus lenses than plus lenses are produced."
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