The Difference Between Eyesight and Vision
Seeing clearly, in itself, is no small feat. As light is reflected by objects near and far, it enters the eye through the cornea. It is then focused through the pupil as tiny muscles in the iris contract and relax, opening and closing in response. The lens, just behind the pupil, changes shape with the help of small muscles in the ciliary body to focus the light onto the retina at the back of the eye. Millions of photoreceptive nerve...
View full press release