* Posts by Phil McKerracher

1 post • joined 22 Sep 2006

Why are so many humans near sighted?

Phil McKerracher

I've read somewhere...

I've read somewhere that researchers think people's eyes can actually grow and change shape slowly in response to viewing out-of-focus images (but only at a certain age, around puberty?). This focus adjustment only works in one direction though (the eye can elongate in one direction but not shrink), which may explain why short-sightedness is more common than long-sightedness.

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