My vision becomes sharper and improves. i am short sighted.
2006-09-04 09:27:12 · 17 answers · asked by mcimpotent 3 in Health ➔ General Health Care ➔ Other - General Health Care
The iris of the eye controls how much light enters the eye, and also the quality of the retinal image. Like a pinhole camera, as the pupil size decreases (i.e. constricts) the retinal blur decreases - causing a sharper image to be perceived. This is why many peoples vision at night is worse as their pupils naturally dilate in low light conditions; this lets more light into the eye, but also causes more blurring of the retinal image. If we 'scrunch' our eyes up, we effectively decrease the pupil size and this results in a sharper retinal image. (The Pinhole effect can be seen by punching a tiny hole in a piece of card and looking through it).
2006-09-04 10:05:10 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Its because you are reducing the field of vision which makes it easier for you to focus. I'm very short sighted and discovered if you look through a tiny hole you can acctually see in focus too.
2006-09-04 23:38:44 · answer #2 · answered by Catwhiskers 5 · 0⤊ 0⤋
You are short sighted, and when you squint your eyes are refocusing.
Put a piece of paper with a pin prick in it in front of you, and look through it, the same thing happens there.
2006-09-04 09:32:39 · answer #3 · answered by michael 2 · 0⤊ 0⤋
It has something to do with limiting the amount of light which enter the eye. You can do the same by looking through a needle hole in a peice of paper.
2006-09-04 09:30:45 · answer #4 · answered by who_me? 2 · 1⤊ 0⤋
Myopia is nearsightedness where a patient can see clearly objects which are close but not which are further away
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2015-03-08 13:42:10 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Because your eye has less space it has to see through, so it's clearer. Basically it can focus better because it has a smaller opening. Try holding up something with a tiny hole in it in front of one eye, and you'll be able to see fine through the tiny hole.
2006-09-04 09:38:58 · answer #6 · answered by Moxie1313 5 · 0⤊ 0⤋
It's not the skin that is causing this effect.
You're actually changing the shape of your eyeball temporarily and slightly. Vision accuity -- nearsightedness and farsightedness -- actually is determined by both the eye lenses and eyeball shape (oblong, oval, rounder, etc.).
2006-09-04 10:08:41 · answer #7 · answered by chance 3 · 0⤊ 1⤋
Because it narrows how much the eye has to focus on. Just as if you couldnt see something so you squint your eyes and it focuses better.
2006-09-04 09:30:24 · answer #8 · answered by Survival 1 · 0⤊ 1⤋
Because by doing so you change the shape of your eye ball and the focal length of your eye lens.hence better focusing leadingto better vision.
2006-09-04 10:36:33 · answer #9 · answered by palmreader 2 · 0⤊ 1⤋
You're probably short sighted and need to go and see an Optician just to get checked out.
2006-09-04 09:30:17 · answer #10 · answered by petepastie 2 · 0⤊ 1⤋