Talk:Pupil

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Anatomy: Gross Mid‑importance

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Goat

Notice that the tag on the goat reads 666. -- Does it have 6/6/6 vision? I'm sorry for all you feet users but this joke uses the metric system. ( And 20/20/20 just isn't funny.)::: Coming to think about it, It was probably added with a computer software.

666 is the number of the devil. Goat is the personification of Satan in Satanism which is called Bafumet. Aminabzz (talk) 11:52, 22 August 2024 (UTC)[reply]

i see no goat...75.5.73.175 (talk)

Alcohol contradiction

The section about dilation says: "Certain drugs cause constriction of the pupils, such as heroin. Other drugs, such as alcohol, cause pupil dilation. Another term for the constriction of the pupil is miosis. Substances that cause miosis are described as miotic."

But the article for miosis has alcohol listed as constricting drug instead of dilating.

Well, this confused me, so I had a look, and couldn't find an obvious answer as to what alcohol does to pupils:

Crash Course Psychiatry, Cameron A, 2nd Ed, 2004. Mosby, ISBN 0-7234-3340-2 says that central nervous system depressant abuse causes miosis. (Alcohol is a central nervous system depressant - Rang, Dale, Ritter, Moore, Pharmacology 5th E, Churchil Livingstone, ISBN - 0-443-07145-4)
Brown B, Adams AJ, Haegerstrom-Portnoy G, Jones RT, Flom MC. Pupil size after use of marijuana and alcohol, Am J Ophthalmol. 1977 Mar;83(3):350-4., PMID-322494 says that alcohol has no effect on pupil size

Can anyone else clear up the picture? Ged3000 (talk) 16:27, 16 May 2008 (UTC)[reply]

dilation

does any one know if your pupils dialte when you tell a lie —Preceding unsigned comment added by 24.12.178.76 (talk) 00:29, 13 November 2007 (UTC) [reply]

Probably, because lying is associated with sympathetic stimulation, i.e. fight or flight response... sweating, rapid heart rate etc. This is just my assumption. cyclosarin (talk) 03:33, 26 January 2008 (UTC)[reply]

Different pupil sizes

If a persone's pupils are two different sizes, (e.g. my right pupil is bigger than my left), does it indicate an improper developement or deficiency of the brain, or is it a common phenomenon in people?--41.182.54.9 (talk) 15:56, 5 April 2009 (UTC)Eugene[reply]

Dilating pupils on command

My friend has control over his pupils. He can simply change the size on command. How is this possible? —Preceding unsigned comment added by 87.59.254.28 (talk) 18:00, 31 August 2009 (UTC)[reply]

light and dark

whin the pupil is in light it is small this attrachson happins whin the puoil has to much light in its way of site so it go small to see in the darck it will go whider so moer light is let in not like the light part is it. —Preceding unsigned comment added by 216.249.72.203 (talk) 17:43, 7 January 2010 (UTC)[reply]

Overly anthropocentric

The eye article is more balanced and covers the subject matter much more objectively. Could someone dig up more information about different types of pupils? I've understood that some penguins even have shape-changing pupils - one shape for air and one for water. --Khokkanen (talk) 23:53, 29 May 2010 (UTC)[reply]

Effect on resolution

Does the diameter of pupil affect the resolution eye can see? —Preceding unsigned comment added by 91.99.164.128 (talk) 13:54, 19 June 2010 (UTC)[reply]

It should affect resolution in the same way it does for cameras: Too big and aberrations cause problems (e.g., older people at night); too small and you would run up against the diffraction limit (although I don't know if that's actually an issue).

I believe I've read that the human pupil diameter results in a diffraction limit that closely matches the size of rods and cones. —Ben FrantzDale (talk) 13:11, 13 October 2011 (UTC)[reply]

Pupil shape

Animal pupils are sometimes vertical - it would appear that this is the same as a number of small pulis stacked on top of each other. This would give more light and the same sensitivity to movements/prey moving horizontally.

If there is a predator that has a horizontal pupil than one could expect it's prey to move vertically. — Preceding unsigned comment added by 122.108.195.232 (talk) 06:50, 13 October 2011 (UTC)[reply]

I have just added a section on pupil shape. During my research for the section I found that cuttlefish and octopus have horizontal pupils and of course their prey can move vertically.__DrChrissy (talk) 17:46, 3 December 2012 (UTC)[reply]

Are all birds' pupils circular

In researching the section on pupils of Non-human animals, I have realised I have not seen any references to birds having non-circular pupils. I have seen one reference that penguin pupils become slits when they enter the water, but I don't thing the source is trustworthy. Does anyone know if all birds' pupils are circular? __DrChrissy (talk) 18:30, 5 December 2012 (UTC)[reply]

A cat with vertical slit pupils

It needs a different picture. A REAL picture, not a flagrantly modified one. This isn't deviantart, it isn't a place to showcase your photoshop skills, it's frigging wikipedia. I'm not going to go to the effort because I know from experience that any change I make always is undone in like 5 minutes by someone else who thinks he knows better, even though he's wrong, I don't feel the need to rearrange the deckchairs on the titanic. But if one of you self-assured arrogant busybodies actually has eyes and looks at the picture of that cat and thinks about what you're seeing for 5 seconds, you can see what I'm saying is obviously correct.

75.175.48.64 (talk) 14:15, 23 August 2014 (UTC)[reply]

Blackness of the pupil

I think it is a persistent widespread misconception that the blackness of the pupil results from the "light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil". Although the retina is not very reflective, instead the most important reason for the blackness is "that the eye and the head of the observer block the ray of lights that illuminate the part of the retina he or she is trying to observe" ^[1]. This effect is caused by the way the cornea and the lens work to uniquely map any point from the outside world onto a unique point on the retina. In other words, to see the retina of an other person you would have to shine a light from your own eyes, which in normal circumstances is impossible without blocking your line of sight.

However, doctors can look into a person's eye and view the retina by using an Ophthalmoscope. Indeed this instrument works by placing a light source close to the eye of the observer without blocking the line of sight from the eye of the observer to the retina of the other person.

I think the article can be best updated by using the quote "that the eye and the head of the observer block the ray of lights that illuminate the part of the retina he or she is trying to observe" in the introduction and add a separate section on the subject explaining the physics, possibly including an illustration.

PeterJanRoes (talk) 08:09, 24 October 2019 (UTC)[reply]

References

^ Timberlake, George D. "The Direct Ophthalmoscope How it Works and How to Use It" (PDF). Retrieved 24 October 2019.

The pupil IS NOT a black hole

I think the first phrase of the article has no sense.

Holes can't have colorations of any kind. A hole is just a gap, a cavity, and any color that could have is just related to the medium it is on (and its transparency) and the light reflection by any material beyond the hole, but not the hole itself that can't reflect, or capture, any light by itself and, so, can't have any color.

I think it should just say "The pupil is a hole".

The only reason I could find to leave it as is it is to give and idea to the reader that is that "black" thing what we have in the eye... but it is not black in first place, so creates misconception. — Preceding unsigned comment added by Wikipuh (talk • contribs) 00:46, 24 January 2021 (UTC)[reply]

Voluntary pupil size changes

The description of voluntary control on pupil size changes should be improved. The referenced article does not state that this happens without changes in vergence/accommodation. In fact it states that accommodation (the lens) changes along for the most bit, but there might be a small change in the pupil beyond the changes that accompany accommodation as part of the near triad. The video also shows that - the sawtooth inward movements of the eye trigger a change in accommodation (as vergence changes) and thereby change the pupil together with the lens. Pupillometer (talk) 08:30, 24 June 2024 (UTC)[reply]

Formation

The article lacks information about the formation of the pupils.

How are they formed in embryos/fetuses? Is it the result of apoptosis in the iris? Aminabzz (talk) 11:55, 22 August 2024 (UTC)[reply]

[1] Timberlake, George D. "The Direct Ophthalmoscope How it Works and How to Use It" (PDF). Retrieved 24 October 2019.

[1]