I read a paper once about female celebs/models and eyesight. They tend to have poorer-than-average vision. The theory was than poor eyesight increased thier percieved eye contact with stangers. (They could not see the other person and so would not look away.) This made them more noticable by others, which is not a bad thing when trying to get jobs in entertainment. An other theory was that they needed to try harder to focus when talking to people at a distance, say at a casting call, resulting in more eye contact.

Also, at extreem low body fat you start to loose the pad of fat behind the eyes, resulting in that sunken look of many supermodels. This of course can reshape the back of the eye and impact vision.

I am short-sighted and when I take off my glasses, I can look at the other person because everything is blurry and I can concentrate better.

A French actor (Christophe Lambert) has a special expression when he looks at the camera. It is because he is short-sighted and does not look exactly in the typical spot other would look at. He could not use contact lenses so there was no way to change that. The people who fought with him in the Highlander series (with swords) said that it was always an adventure because he was not really sure where he was hitting.