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Pupil
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.
Dr. Richard Bensinger reviewed this
54 year experience in Ophthalmology
How long it usually lasts:
Related questions
A 25-year old male asked:
What excatly is pinpoint pupils?
1 doctor answer • 1 doctor weighed in
A 53-year old asked:
What can cause off-center pupils?
1 doctor answer • 6 doctors weighed in
A 49-year old asked:
Why are my pupils two different sizes?
1 doctor answer • 2 doctors weighed in
A 16-year old male asked:
How common are slightly oval shaped pupils?
1 doctor answer • 1 doctor weighed in
A 35-year old asked:
Tiny white dot in my pupil. What could it be?
1 doctor answer • 2 doctors weighed in
A member asked:
What causes pupils to be nonreactive to light?
2 doctor answers • 4 doctors weighed in
A 34-year old asked:
How is it that someone's pupils might be blown?
1 doctor answer • 1 doctor weighed in
A 28-year old male asked:
What is the definition or description of: pupil?
1 doctor answer • 3 doctors weighed in
A 37-year old asked:
I'm wondering how small and big can the pupil get?
1 doctor answer • 3 doctors weighed in
A 44-year old asked:
Please explain why might someone's pupils be blown?
1 doctor answer • 2 doctors weighed in
A 41-year old asked:
Why are my pupils naturaly bigger then most people's?
1 doctor answer • 1 doctor weighed in
A 33-year old asked:
Do you think I should be worried about uneven pupils?
1 doctor answer • 3 doctors weighed in
A 46-year old female asked:
What does it mean when you pupils are not responding ?
1 doctor answer • 5 doctors weighed in
A male asked:
My sons Pupils are different sizes, what should we do?
1 doctor answer • 1 doctor weighed in
A 43-year old asked:
Is it typical for a baby's pupils to be different sizes?
1 doctor answer • 3 doctors weighed in
A 37-year old asked:
How could having more than one pupil affect your eyesight?
1 doctor answer • 3 doctors weighed in
A 25-year old female asked:
What would cause the pupil to be constricted all of the time?
3 doctor answers • 6 doctors weighed in
A 31-year old asked:
Is it normal that my pupils seem to be different sizes sometimes?
1 doctor answer • 1 doctor weighed in
A 20-year old female asked:
What could cause my left pupil to spasm in reaction to direct light?
1 doctor answer • 1 doctor weighed in
A 33-year old asked:
Can it be adie's pupil even if i tested positive for horner's syndrome?
1 doctor answer • 1 doctor weighed in
A 38-year old asked:
Wondering if it's normal for my pupils to get bigger when i'm in the light?
1 doctor answer • 2 doctors weighed in
A 28-year old asked:
Is it possible to obtain vision for a person who got his pupil removed because of an accident?
1 doctor answer • 4 doctors weighed in
A 44-year old asked:
I am doing research for a story I am writing and i was wondering if you can see without pupils?
1 doctor answer • 1 doctor weighed in
A 31-year old male asked:
The last couple of days i noticed that my left pupil is slightly bigger than my right is that normal???? why?????
1 doctor answer • 1 doctor weighed in
A 21-year old female asked:
I have this white line in my pupil that causes no pain and has been there for years, should I be concerned about it?
1 doctor answer • 1 doctor weighed in
A 33-year old asked:
Can you see without pupils? I'm doing research for a story i'm writing and i was wondering if you can see without pupils?
1 doctor answer • 1 doctor weighed in
A 20-year old male asked:
My pupil size is big than other which happened due to an injury...Am i be worried? Any solution for getting back normal?
1 doctor answer • 1 doctor weighed in
A 19-year old female asked:
Pupils are naturally generally very large. Don't like how big they are. is there anything to do about it? Why are they like this?
1 doctor answer • 1 doctor weighed in
A 30-year old female asked:
What can cause unequal pupil size?it is not very much bigger than the other one and it contracts fast to light. And should I worry?
1 doctor answer • 4 doctors weighed in
A 18-year old asked:
How much should pupils react to light? When I turn light on they get a little smaller then right back to normal. They usually react better. Is it ok?
2 doctor answers • 5 doctors weighed in
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