Do they? I mean if you keep them closed for a while.
2007-08-12 12:08:59 · 17 answers · asked by spazzist 2 in Science & Mathematics ➔ Biology
yes they do, hence when you look in the mirror after having your eyes closer for a length of time, your pupils quickly shrink, to let in less light ... trying to see with your eyes closed is hard, but your eyes keep trying anyway ... dilating pupils is their way of trying to let in enough light.
2007-08-12 12:33:56 · answer #1 · answered by Anonymous · 1⤊ 0⤋
That's a bit like trying to establish if the light goes out when the fridge door is closed. Pupils dilate in darkness since it's
dark when your eyes are closed I would think they do. If you
close your eyes for a little while then open them in front of a mirror you will see a rapid change in pupil size. Just tried it!
Good question.
2007-08-14 01:27:54 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Yes.
Actors use this if they have to enter from the 'wings' (sides of the stage) on to a darkened stage, to see and find the place where they are supposed to be standing when the lights go up. The audiences eyes will still see a dark stage, whilst the actor - having had eyes closed (possibly with a hand covering them to avoid light coming through the eyelids *) and getting a tap on the shoulder from stage management or a fellow actor when the blackout happens, can move fairly confidently in such residual light as is available from emergency exit signs, bits of luminous tape etc.
David.
*If you just close your eyelids, and the light is very bright, the cones in the retina see red light because of the fine blood vessels in the lid, and everything will seem tinged with green for a while when you open your eyes. No time or space to explain - but try looking up retina cones and rods.
2007-08-13 12:04:44 · answer #3 · answered by Barbarossa 3 · 3⤊ 0⤋
Yes, your pupils dilate in response to light and dark. A muscle in your eye constricts the pupil when it's light out. If it is dark they will dilate. If your eyes are closed it will obviously be dark.
2007-08-12 12:17:08 · answer #4 · answered by makeyouknock 2 · 0⤊ 0⤋
Pupils dilate to allow in more light so when you close your eyes they grow huge to try and allow in more light.
APPARENTLY when you fancy someone your pupils become large because your eyes cant get enough of the person ;)
2007-08-14 03:36:25 · answer #5 · answered by Miki 2 · 1⤊ 0⤋
NO, The pupils dilate and contract only in response to amount of light entering the eyes when the eyes are open.
2007-08-13 17:46:21 · answer #6 · answered by Janu 4 · 0⤊ 1⤋
Try sitting in the sun and closing your eyes for five minutes. If you open them and go blind very painfully indeed - then yes - your pupils dilate when you close your eyes.
2007-08-12 12:15:39 · answer #7 · answered by Anonymous · 2⤊ 1⤋
Pupils dialate to take in more light when it is dark and they retract when it is light to keep too much light from entering the eye. Therefore when the eye is shut, there is no need for them to do either one. However, when there is a head injury, or the person is on drugs it can effect their dialation properties without light or darkness as a factor.
2007-08-12 12:15:13 · answer #8 · answered by 'Sunnyside Up' 7 · 4⤊ 1⤋
The pupil (Latin pupilla "little doll" > pupa "doll") is the variable-sized, black circular or slit shaped opening in the center of the iris that regulates the amount of light that enters the eye.[1] It appears black because most of the light entering the pupil is absorbed by the tissues inside the eye. Also known as dial pupilation
2007-08-13 04:56:15 · answer #9 · answered by Anonymous · 0⤊ 2⤋
They do. I've done the mirror trick too. Close your eyes infront of a mirror (up close) then open them. You should see your pupils adjust.
2007-08-13 09:52:14 · answer #10 · answered by Cpt. Willard 4 · 0⤊ 0⤋