How do the eyes adjust to the dark and the light. Do they adjust faster in the dark or the light?

Question

anonymous · Answer

https://www.connexus.com/content/media/140991-10112006-111711-AM-2005434625.gif

lanre · Answer

Our irises (the opening into your eye through which light goes...looks like a black spot right in the middle of your eye) dilate to collect more light. If we are in an environment where there is absolutely no light then we would see nothing. But even at night there is SOME light, whether from the moon or another source, so our irises widen substantially to collect as much light as we can. Try shining a light in your eyes at night after a few minutes in front of a mirror. Your irises will look huge. Eyes adjust faster to the introduction of light. It can take up to one hour to become fully acclimated to darkness. This is the case for healthy eyes at least. Some retinal pathologies make accommodation to darkness almost impossible, example retinitis pigmentosa. check: http://answers.yahoo.com/question/index?qid=20090206134155AAyUgRJ