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 if i hold my eyes open when i sneeze will my eyes pop out?

 what happens if I don't wear glasses for 3 days?
I'm going somewhere, and I want to know if anything will happen to me if I don't wear glasses for 3 days?
*I can't see very clear without ...

 i have goo in my eye and its all puffed up?
so i wake up and my eye iches, then i look at it and there is like the white stringie goo crap in it, what do i do to get it out and get it back to normal ...

 What is my eye color? Please awns-er!?
Ok I have always thought my eyes were brown but now i am looking closely at them and they look dark brown with gold and a gray lineing what is this color?...

 What am I seeing?
When I blink, alot of the time I will se black dots and sometimes I see these like, see-through wormlike things, They look like worms and some are ssquiggly and have light lines in them. What in the ...

 How do a blind person know when to sleep?
How do they know when it's night or day, when it's dark or light.
Additional Details
listen, our body's biorhythm depends on outside stimulants such as dark and light, and ...

 Eyes changed from grey to brown when I was a baby. Is that really possible?
Or is my mum telling fibs....

 Is it harmful to look at the sun?

 Should I wear glasses all the time? I'm short sighted.?
I am short sighted and have been told that I need to wear glasses or it's only going to get worse. However, one optometrist that I went to said to wear them all the time and another said no to ...

 I am sacred that I will need glasses. Please Help!!!!!!?
I am sacred that I will need glasses because I have heard that they can be very annoying and that everyone would take the mick out of me. And OUCH the price of glasses.

Even though I haven&...

 What's wrong with my eye!? (pics included)?
OK, so yesterday while I was watching TV, my eye started to hurt. Not my actual eye, but my lower eyelid and the area under it. Then it slowly began to swell and get all puffy. Now, almost 24 hours ...

 I can't stop blinking my eyes.?
lately, for the past two days, i have been blinking soooo much. Like twice every second. Literally. It feels my eyes are cold, and there is constant blowing. Like its the feeling when you stick your ...

 can one eye be bigger then the other one?
not the pupil, but the whole eye itself?...

 Is it weird that one of my pupils is bigger than the other?
I've noticed for the past couple weeks or so that one of my pupils is bigger/more dilated than the other. It doesn't matter what light I'm in - it doesn't change (the other one ...

 Caffine makes me cry?
as in, when i drink soda i always get teary eyed. it happens for a lot of things. i really really hate it sicne when a friend sees me she goes, "are you like crying?" and i'm always ...

 People that wear glasses: Please answer these eye questions?
Could you please answer 3 questions :-) I am very curious after a recent visit to the opticians!

-What is your eye grade? Is one of your eyes worse than the other?

For ...

 i see weird moving lines / dots whenever i look into the sky?
does this happen to other people? i remember one of my other friends said how he saw things like that too when looking up at the sky

its just like small lines, some are twisted around into ...

 Do you have glasses ? (This is a serious question)?
Well im 13 I went for an eye test yesterday and found out that I need glasses I'm not sure what kind are , like trendy, can you help me?
And if YOU wear glasses what do they look like ?

 Am I an ****** just because I won't let my girlfriend get laser eye surgery, glasses or contacts?
She is as blind as a bat, and I am afraid that she will fly away just as fast as one once she figures out that I look like Quasimodo after a car wreck.
Additional Details
Wow... Yapoo ...

 At 16 can your eye color still be changing?
My eyes used to look really dark hazel, and if I used a ton of reddish eyeshadow I could draw out some of the green. But for the past month or so, they have been looking so green! (even when I don...

Cσηνєяѕє Cяαzу ☂
What causes the eye pupils to expand and contract?

coco jo
light and drugs

the light around you.



some1 told me they do when you horny or angry

Graham R
If there is too much light your, pupils contract so less light is let in. If there is too little light your, pupils expand to let in more light.

♥♥ ~* Just Janz *~♥♥ ║│▌│║▌║™
When bright light is shone on the eye, it will automatically constrict. This is the pupillary reflex, which is an important test of brainstem function. Furthermore, the pupil will dilate if a person sees an object of interest, or if the amount of light is lowered.

Mini Me
Endorphine etc, etc XD

bright light makes them contract and dim light makes them enlarge

Dream like
the light.
its so weird, look at someone when the lights are turning on there pupils will get dramatically smaller its quite scary..

Lost n Coma & Covered in Cake♥EM
changes in light ^-^

when it's dark ur pupil gets bigger casue it need to be able to take in as much light as possible

It gets smaller in light to prevent the pupil being damaged

*ℓเℓ ๓เѕѕ ¢hαттєявσχ*
iris....it is the colored muscular diaphragm and has an opening called pupil through which light enters........when you are in very bright light, the iris expands and as a result the size of pupil decreases........and when you are in dim light, the iris contracts, increasing the size of the pupil so that more light can enter....


Expand=Dilate. Contract=Constrict.

Here is a list of some things that cause each.

Dilate: Low light conditions; some eye drops; looking up from a book to something that is far away; getting hit in the eye by a blunt object; becoming excited (see a previous answer); nerve damage

Constrict: Bright lights; some eye drops; looking from a far away object to something that is 12-to-16 inches in front of you; inflammation inside of your eye; nerve damage (different nerve than the one mentioned for Dilate).

your pupils dilate [get bigger] when your iris opens out [the coloured part of your eyes] to let in smaller or greater amounts of light, so as not to damage the retina at the back of your eye.

these 'muscle contractions/expansions' are caused by light intensity, emotional reactions and can also be affected by the use of drugs etc.

♥ Rockii ♥
They are light sensitive. The iris is a muscle which contracts and relaxes the muscle. The pupil shows how the muscle moves when subjected to light and dark

Drugs also make pupils apprear dilated, and apparently so does being attracted to someone

Light causes the pupils to expand and contract because the pupil is what absorbs the light in your eye. It expands when there is minimal light because you need the most light to see clearly and contracts when your surroundings are bright as to dim the brightness. Other than light other things such as drugs can send chemical messages to you brain that can result in effects such as dilated pupils.

Dr Frank
Literally this is due to the effect of various stimuli on the iris, which acts like the adjustable opening (aperture), of a camera.The most obvious of these is light, but it also reacts to accommodation, focusing on images at differing distances from the eye.

Arwen the Original.
Its to let in light. It goes small when there's too much light and large when it starts to go dark.

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