A.S. wrote:

In one of the insulin articles (?) I read that the IGF (insulin like growth
factor) was it who caused the eye to *grow* too fast, thereby lenghthening
the eyeball, thereby causing shortsightedness.



Dr. Cordain said it's from reading too much when young. Something about
blurred images get projected on the back of the eye and tell it to keep
growing longer. High price to pay for doing something that's good for you