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Health Forum    Optical
Health Discussion Forum

 Is it bad to wear glasses when you don't need them?
I am nearsighted, so I have glasses for the boards at school and stuff. Is it bad to leave them on for reading, because I can read with them on but I don't need them for reading? It's just ...

 I Just dipped my tongue in visine will anything happen?
I dipped my tongue to taste visine. I didn't swallow it , and i'm scares what should i ...

 help with contact lenses?
im getting contacts later this week, and im having trouble decideing on a brand.. i know theres lots out there so i was wondering what people with contacts like

is acuve, acuvue 2 or ...

 I'm like staring at the computer the whole day and my eyes feels very tired and blurry. Eye stress perhaps?
I sit and stare at the computer 6days a week as my job requires me to. My eyes are really tired and my visions do sometimes get blurry. This causes headache at times as well. What is the cause of ...

 Is it very risky to get LASIK at 18 years old?
Hi there,

My mother recently got LASIK and now I am actually considering it myself.

I've always hated glasses and contact lenses and have found that my eye sight has gotten ...

 How can I improve my eyesight?
I'm doing a Uniformed Public Services course at College and I really want to become a firefighter. I've read lots of books on becoming a firefighter and they all say that excellent vision ...

 Blonde Hair & Bright Green eyes?
Okay my name is Aleisha & i have blonde hair a bright green eyes some friends & teachers say that blondes don't usually have that combo is that true? or are they just liars lol i'm A...

 what color contacts go with very dark brown eyes and black hair (im indian)?
hey this is my first ever question!!! im soooo excited for your answers!!!! all right so! i have VERY dark eyes, and considerably large eyes as well (it runs in my family) i have black shoulder ...

 White part of my eye turning a faint yellow colour, why?
hey, i'm 15 and i've lately been spotting in the corners of my eyes (when i look in the mirror) that they are turning a faded yellowy colour. Im a vegetarian, so can that be a possibility ...

 Are eye contacts really bad for you? (true or myth?)?
So I was searching on Yahoo Answers for some contact information and I found this answer and it made me change my mind about getting colored contacts.

"color contacts aren't good ...

 I've had this white stringy discharge coming out of eyeball I get the discharge on and off all day....?
what is this and how do I treat it?...

 i can see a black dot when looking out of my left eye. it moves around depending on the direction i look.?
basicly it must be on the eye because it follows my direction of sight ? what is it and how do i get ...

 well ii would want to know how can ii make my eye color change with out any surgery or contacts?

 Is something wrong wiht my eyes?
Okay I think this has been happening for years. Sometimes (this happens allot) it's like everything goes black or gray and I feel like I'm going to pass out and I feel like someone punched ...

 Help this is serious( contact lenses)?
I cant take off contact lenses ive been trying everything they wont even move how can i make them fall ...

 if my eye sight is goin kinda blurry, are my eyes going to be ok?

 What Color Contact's Should i Get?
if you have personal experiance with contacts prescribed or not can you tell me some pros and cons

ThiS iS Me:http://s171.photobucket.com/albums/u284/tiffanywifey01_2007/?action=view&...

 I feel like there's something in my eye?
Sometimes for no reason, I feel like I have something in my eye. It's an acute irritation, not all over my eye.I look at my eye and there is nothing there.This seems to happen often, almost ...

 What colour is my eye?
I am just wondering cause one I am partially colour blind and ive asked a few friends and they said blue/gray with green bits like dots of green type thing, now I just wanna know what you guys think ...

 What does it mean when someone gives no eye contact ?

Bottom Line
Why do we squint in an effort to see distant objects more clearly? And does it really work?

don't know, but squinting doesn't work, remember episode of Seinfeld, George is squinting and thinks he saw two people kissing but it was a horse and police officer...

We squint to avoid some sunlight so that our pupils will widen to take in more information.
Yes, it works.

This is because when we squint, we narrow and tighten our feild of vision, thus focusing on the object more clearly. when we squint, less light comes into the eye from unwanted places and more light comes from the object we are trying to see.

Patrick K
I suppose we try to focus on the object, and enhance the features.
Maybe some evolutionary trait??

I think it works.

When we squint the lens inside our eye, squeezes too. That makes the focal length of the lens be at a more distance then the usual.
Hence trying to squint can make things at a distance appear closer, clearer.

I believe squinting changes the shape of your eyes, like for instance I wear contacts/glasses. but when i'm not wearing them, I can actually apply pressure to my eyes and I can see things more clearly. Squinting has this same effect, with less effort.

Paul MB
When light goes through a window that has parallel surfaces, it sort of bends a little, then get's bent back and goes straight through, in effect.

When we use a lens, the light rays that hit the angled surface is also bent, then goes through the lens itself, hits the other surface which interfaces with air, and with the changes in refractive index or how much that material will bend the light, the light is bent again. Eventually all the light rays are redirected so that they cross the center UN-DEVIATED light ray at a point. this point is the focal point of the lens.

When we squint or pinhole, we eliminate the bent rays and just use the undeviated or minimally deviated ones so that our depth of focus is very large and things appear much clearer. This is the basis of pinhole glasses. One just uses the central light rays.

That's really all there is to it.

S ♥ S
to focus on that object, by squinting our eyes we only focus on that one object.
It works but causes headaches.

Because when you squint, it causes your pupils to enlarge and allow more light into your visual receptors. Yes it works slightly.

Bob the Boat
It helps in strong light, so the optic nerves have less information to deal with, so the brain department can assimilate what you are looking at a bit quicker.

In the land of the blind, the one-eyed man is king

the muscles behind your eyes push and your lids squint to hold them in place.
so it helps your pupils adjust to whatever long distant vision it may carry...halps you focus better.

John H
Hey, good question. (I suspect it is more for Old people than Young)

The answer is that we use our eyes in much the same way a camera uses its lens to focus images.

The lens in the eye however works in an unusual way, in that to change the focal length, the muscles in the eye squeeze or relax the grip on the lens, greater pressure, the wider the lens becomes and the further the focal length (the distance to the retina remains fixed obviously).

As people get older, and with certain diseases, the lens becomes less pliable, and a greater effort is required to compress the lens to achieve the desired focus, so squinting helps by using additional muscles to force the lens to the correct focal length to enable the image to be correctly focused on the retina (to be deciphered as sight).

Yes it really works.

Why So Serious
when you squint your eyes vision focuses more clearly. you close your eyes a bit so you dont see as much from the top or bottom only the middle and since you see the middle your eye focuses its vision their more allowing you to see farther

and yes it really does work its a scientific/medical fact

Amy B
haha i just tried it and it didnt really work for me!
soetimes if people have reeeeally bad visoin they tend to squint (Who knows why!)

Pedestal 42
Unless it is so bright that the half-shutting of the eyes helps by *reducing* the amount of incoming light and glare,(url) only Buffy and Red-winged Blackbird are on the right track.

If there is an uncorrected refractive error, part-closing the eyes produces a smaller effective pupil, and hence a better depth-of-focus effect and less blur.

Looking in the distance, without necessary glasses, through a 1mm hole in a piece of paper or card demonstrates this "pinhole camera effect" quite markedly.

If there is no refractive error the effect is marginal or nonexistent.

I don't know why we do it but it works for me. I am near-sighted and when I don't have my glasses on, and I squint to see a road sign or something, it becomes a little more clear. Not much, but enough.

It works, all right. In fact, the word "myopia" (nearsightedness) comes from the Greek words myein (shut) and ops (eye). When you squint, it's like reducing the aperture of a camera lens: You reduce the diameter of your visual lens. This gives you a longer depth of focus.

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