why are you not accustom to the lights on when you have been in the dark a long time?

Question

can you give me info? like why are you not accustom to the light on ...like nit takes longer to get used to thaat having the lights off?

help!

Answer 1

When it gets dark, two things happen with your eyes in an attempt to see as much as possible with very little light: first, your pupils dilate as much as possible (open wide) to let in as much light as they can. Second, your eyes send extra chemicals to hyper-activate the rods (the light-sensitive part of your eye that's NOT sensitive to color), which is why in low light it's harder to see color, since the color sensing part of your eyes are basically being ignored. It takes 15-30 minutes to get fully "dark-adapted", at which point you're seeing as well as you can in the dark. If you then turn on a bright light quickly, your pupils are wide open and your eyes very sensitive, and you'll overload the eyes for a few seconds (and it can hurt a bit!) -- your eye has to switch chemical modes back to sensing color, and close down your pupils, and it takes a little time.
Hope that helps :)

Answer 2

The reason for that is built in reflexes in the human body (evolution, if you want). The reason is the pupil in your eye. The pupil is the black thing in the middle of your eye and the reason that it is black is because all the light that goes through is obsorbed by tissue.

Anyway, when it is bright, your pupil actually contracts, meaning becomes smaller in size. It does that because it wants to limit the amount of light going in. That is why when all of a sudden you go from sunny outside to a dark room, you can't see well because your pupil is smaller and now not enough light is going through your pupil for you to see details (sometimes completely).

So if you stay in the dark, sloowwwwwwwwwwwwlllllllyyyyyy your pupil opens up to allow more and more light in and then you can see in the dark room.

The same happens the other way around. When you have been in a dark room for a long time, your pupil is wide open, and all of a sudden if you go outside, there would SO MUCH light going in that your eyes would actually hurt. That is why everything would look VERY bright. So if you stay in the light, your pupil will slowly close up again and everything will look normally.

This is actually a reflex so I don't think that you really have much control over it.

These same principles are used in cameras and their lenses. If you are shooting a picture in dark, the aperature (automatically or manually) opens up to allow more light in the pic so the pic looks bright. That is exactly what the aperature settings on your camera are.

Just to let you know, the reason for this is that whatever the opening is, 100% of the light never goes through. Only a part of it does. So even though, you think there is enough light but when you look at the screen of a camera or the pic after you take the pic, it looks...much darker. Your eye is the most effecient lense that we know of and even then it allows only about 30% of the light go through.

Cameras and their lenses are much worse obviously. That is why, when a movie is made, REALLY REALLY BRIGHT lights are used but when it is filmed and processed, on our TV, the light just looks normal. In order to show us 100% daylight, they have to use like 400% of daylight because the camera lense would only capture a quarter of the light coming in.

Answer 3

because of the amount of light that is allowed into the pupil of the eye. the more light there is, the smaller the pupil, and vice versa. that's just the way we were made..

when you are in the dark for a long time, your pupils dilate (or get bigger), so that they can let whatever light they can inside your pupil. since your pupils are larger in the dark to allow more light in, your eyes become ultra sensitive when the lights get turned on because the pupils are "open-wide" letting too much light into your sensitive eyes.

I'm no ophthalmologist, but this is as simple as I can get it for you..sorry

Answer 4

It takes a while for the pupils of your eyes to adjust. The pupils of your eyes are like the f stop on a camera. They adjust to let in more or less light.

Here's something neat to know about the pupils of your eyes. If you see something frightening or ugly your pupils will constrict. If you see something interesting or beautiful your pupils will dilate. Next time you talk to someone check the pupils of their eyes. It may give you a clue about them, ;-)

Answer 5

your pupils in your eyes dilate to try to see in the dark, so when the lights get brighter, your eyes are too sensitive to it. the pupils need to get smaller again.

Answer 6

In the dark your eyes dialate, and when you go into the light it takes time for your eyes to adjust to it.
oops had it backwards!!!!

Answer 7

because light burns your retina briefly when it is exposed to bright light after being in the dark. also your iris has to re-adjust its size because it is enlargened in the dark and shrinks in bright light.

Answer 8

Because your pupils dilate, to let more light in.

Answer 9

PUPILS ARENT CLOSED WHEN LIGHT IS DIM.....AND THEY NEED SOME TIME TO RETRACT SO AS NOT TO SHOCK THE OPTIC NERVES.

Answer 10

eat ur carrots or u become like helen keller