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Doctor insights on: Pupil

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Pupil (Overview)

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 "red eye" in photographs.


Pupil (Overview)

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 "red eye" in photographs.


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Please explain why might someone's pupils be blown?

Please explain why might someone's pupils be blown?

Blown pupils : Are dilated pupils. This can occur for a variety of reasons. Drugs, both legal and illegal, poisonings, and in conditions affecting the brain like head trauma, stroke, tumor or bleeding. ...Read more

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What causes small pupils?

Many causes: Without more information, the most inclusive answer is numerous medical conditions, prescription and non-prescription medications, and/or illicit substances. Some of these conditions and/or medications/substances can be harmful/lethal without medical attention. ...Read more

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My pupils are not centered, why?

My pupils are not centered, why?

Strabismus: This is a condition called strabismus and usually has to do with a weak eye muscle. Please see an ophthalmologist for evaluation soon ...Read more

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What eyedrops make pupils bigger?

What eyedrops make pupils bigger?

Dilating drops: Drops like phenylephrine, tropicamide, cyclopentolate, Atropine will dilate the pupil. ...Read more

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What do enlarged pupils look like?

Bigger than normal: The pupil, the dark part of the eye when enlarged have a significantly larger part of the than when not enlarged. ...Read more

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How small and large can the pupil get?

How small and large can the pupil get?

A Complicated Issue: The pupil can get as small as a"pinpoint"or so large it fills up the whole space and you look like a zombie. Depends on the cause Uh, you're not a zombie, are you? Usually those extremes aren't reached and the pupils are "small" (like 2mm)or"large"(taking up maybe 2/3 of the space). Why do you ask? Have you entered a Zombie pupil dilatation contest? Well, sorry, if you're dead they'd be "mid-position! ...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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What problem are unequal pupils a sign of?

What problem are unequal pupils a sign of?

May be normal, or no: Unequal pupils (anisocoria) can be seen in 10% of normals. May be seen with abnormalities of the cranial nerves, multiple sclerosis, other issues. New finding? See your doc for sure to rule out a serious problem. ...Read more

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How do you treat uneven pupils/anisocoria?

Normal or not: In some people there can be a slite natural difference between pupils. If there is no neurological basis for this then it could be from a horner's syndrome from neck trauma, old direct trauma to the eye, old intraocular inflammation or several other potentially benign origins. There is really no treatment for qualizing the difference in pupils. ...Read more

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Is it weird to have extremely small pupils?

Is it weird to have extremely small pupils?

No: It all depends on the light necessary for yours eyes to do their job. Medications can also effect the size of pupils with the most common for causing small pupils to be opiates. ...Read more

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Unequal pupils sizes, is there really a cure?

Unequal pupils sizes, is there really a cure?

Anisocoria: Is a condition of unequal pupil sizes. Affecting 20% of the population, it can be an entirely harmless condition or a symptom of more serious medical problems. Have it checked out. If it is harmless, just ignore it. If there is an underlying medical problem, then that is what needs to be treated. There are medicines to make a pupil larger or smaller, and the strength can be adjusted. Don't do that ...Read more

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Tiny white dot in my pupil. What could it be?

Tiny white dot in my pupil. What could it be?

Get it checked: The pupil is the black space where there is a central opening in the colored iris. So, there should not be a white dot in the pupil as this would actually be inside the eye. It is probably on the cornea, which is the clear dome over top of the iris and pupil. However, a white spot on the cornea is not good, as it could be an ulcer, a foreign body, or scar. ...Read more

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What does having extremely small pupils mean?

Nothing really: It means just that. Pupil size is based on your eyes/brain determination of light need for vision. Some medications can cause small pupils. ...Read more

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Is it okay that my pupils are different sizes?

Depends: Some people have pupils of different sizes with no other problems. In others, it's a sign of significant injury to the central nervous system. ...Read more

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Does the size of your pupil affect your vision?

Does the size of your pupil affect your vision?

Not really: The pupil size varies with light exposure but vision will not change. Any non reaction or difference in size between pupils warrants an exam with the ophthalmologist for full evaluation. ...Read more

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What is the definition or description of: pupil?

Eye window: 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 "red eye" in photographs. ...Read more

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I have an unequal pupil size, should I be worried?

Probably not: Unless you have had some direct injury to the eye or to the nerves to the eye, it is probably ok. There is commonly a little difference between pupils and if the difference is 1 mm or less, that is considered normal. If you vision is fine and the eye feels fine, don't worry about it. ...Read more

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What are reasons why my pupils are always so big!?

Natural: Pupils vary in size and lighter colored irises tend to average bigger. Even some darker ones are bigger. Unless there is a drug involved, this is just a natural variation and as long as the iris reacts normally to light, there is no worry about the health of the eye or vision. ...Read more

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Please help! What happens when your pupils dilate?

Dilation: Occurs because of contraction of radial muscle, (controlled by sympathetic nervous system). ...Read more

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I'm wondering how small and big can the pupil get?

I'm wondering how small and big can the pupil get?

Pupil: Pin point is smallest and full dilated is largest. Great pictures at Google. ...Read more

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Why might someone have a gold ring around both pupils?

Keyser-Fleischer: They are copper deposits due to a condition called Wilson's disease. It could also be Fleischers disease which is caused by iron deposits and affects the shape of the cornea. ...Read more

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How could having more than one pupil affect your eyesight?

Alters focus: Having more than one pupil, which is unusual, comes from trauma or a few rare degenerative conditions of the iris. If the two pupils are close to each other, then this would produce two focus points on the retina — a condition of doubled vision, . This is usually poorly tolerated and your ophthalmologist has ways to fix this. ...Read more

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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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Do people with cushing's syndrome have constricted pupils?

Do people with cushing's syndrome have constricted pupils?

Not likely : Cushing's does not really cause miosis (pupil constriction). There are many causes, but prominent are many drugs (opiods, anti-psychotics, razadone). ...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