I have myopia and I read that the rays of light intersect before the retina.
When I can not see clearly I can push somehow my eye muscles and can see a bit clearly. The object gets clear but moves some distance ahead (getting smaller).
My question is: What is in fact happening to the eyeball? Do the eye muscles contract it and make it more round than ellipsoid thus bringing the retina forward so the light intersects on it?
In fact I have the feeling that the eye ball gets longer (ellipsoid).