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Doctor insights on: What Makes Your Pupils Dilate

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Why does your pupil dilate?

Why does your pupil dilate?

Pupil: Because a part of the autonomic nervous system (sympathetic) , when stimulated, will caused two sets of muscles in your iris to change the diameter of the whole in the center (the pupil). ...Read more

Pupil (Definition)

The pupil is the opening in the iris inside of the eye though which light is focused on the retinal film at the back of the eye. The iris can open and close in response to light to vary the amount inside the eye. It is what looks red, in the ...Read more


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What drugs cause your pupils to dilate?

What drugs cause your pupils to dilate?

Dilation: Many drugs can cause pupil dilation. Some include cocaine, amphetamines, and MDMA. Additionally, some non-illicit/ recreational medications such as anticholinergics and antidepressents can cause dilation. ...Read more

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Please answer! what would cause your pupils to not dilate?

Please answer! what would cause your pupils to not dilate?

Pupils dilate and: constrict under control of cranial nerve 2 and 3. 2nd senses light and 3d adjusts pupil to control light input. No dilation = deficit in one or the other or a medication in the eye has poisoned muscle function. Would be very unlikely to inadvertently notice that both pupils do not dilate. Close eyes in bright room then open while friend observes. If they constrict they must have been dilated. ...Read more

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Why do pupils dilate when using certain recreational drugs?

Effect on nerves: Recreational drugs affect the nerves of the autonomic nervous system that controls the pupil function. Many recreational drugs like opiates cause narrowing of the pupils. Withdrawal causes dilation due to return of the nerve function to the opposite direction. ...Read more

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What does it mean when your pupils dilate and then go smaller?

Reaction to light: Much light causes pupils to constrict to protect the eye from the flood of light that will cause blurred vision. In dark the pupils dilate larger to allow more light inside the eyes for better visibility. Also, looking at near and far objects causes the same accomodation changes. We call narrowing of pupil meiosis and dilation mydriasis. ...Read more

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What to do if I had an appointment yesterday and they used it to dilate my pupils. I think it's pretty cool stuff. could I buy it somewhere?

NO : This is not something you want to do . The purpose is to see inside the eyes for diagnostic purposes. Too much light can make you very dizzy and trouble to see. If they become dilated can also precipitate a glaucoma attack . I recommend against this idea. ...Read more

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My pupil does not dilate like others in the darkness or nighttime, it dilates very little. I have small pupil all the time comparing to others.. Why?

Does it match L--R?: If you have asymmetric pupils, you should see an eye dr for exam. If your pupils match in size l-r, but are smaller than others', that may just be you. ...Read more

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My right pupil will randomly dilate for & stay that way for 24 hours. When I wake up the next day it is completely normal. Occurs about twice a month.

This is: definitely ABNORMAL and you should start by telling your Primary Care Medical Provider who may want to refer you to an OPTHAMOLOGIST ..what is INTERMITTENT now may become PERMANENT if there is an injury to the nerves in that eye.... Hope this is helpful! Dr Z ...Read more

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What are the causes of dilation of pupils?

A few things: I assume you mean dilated and not responding to light. This can be caused by a number of drugs including scopolamine, atropine, most hallucinogens and many others. These should cause the pupils to be dilated equally (unless directly applied to one eye). If your pupils are not equal, then we start to get worried about problems like a head injury and you should seek immediate medical attention. ...Read more

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