These changes allow you to see well in different lighting environments. The pupil widens in a poorly lit areas to let in more light while the opposite happens in brightly lit areas. Its size varies depending on the environment.
The pupil is an aperture that allows light to enter the eye.
While this will mostly explore eye health, dilated pupils in particular, it is a good chance to learn about one of the more predictive parts of the body. The normal pupil size in adults varies from 2 to 4 mm in diameter in bright light to 4 to 8 mm in the dark. It generally turns out well for the patient, but it underscores the importance of the pupil and the information it contains about your overall health. One of the first things the doctor does is flash a little penlight into a person’s pupil, usually wagging it back and forth. You see it on every television medical show. Pupils dilated for long periods can be harmful to your long-term vision. If your eyes stay dilated for an extended time, doctors will investigate whether you have mydriasis or whether you have another underlying condition. Pupils will also dilate, or grow large, under poorly lit conditions.īut pupils can also dilate because of a trauma or injury, particularly a brain injury, as a reaction to medication and because of exposure to some plants. Dilation is not a natural state for your eyes, and it usually happens because of eye drops given prior to an eye examination. Dilated pupils are pupils that are larger than normal.
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