My optician said the eyeball was not quite the correct shape. It causes the focal point of image to be slightly in the wrong place, and not perfectly on your retina.
He explained it like this:
For English people:
> Instead of your eye being spherical like a football, it’s shaped more like a rugby ball
For American people:
> instead of your eye being spherical like a soccer ball, it’s shaped more like a football.
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