Change your eye pupil size voluntarily?
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Change your eye pupil size voluntarily?
"Man Can Change His Pupil Size on Demand, Something Scientists Thought Was Impossible"
https://www.sciencealert.com/this-germa ... on-command
(as linked from Instapundit.)
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Re: Change your eye pupil size voluntarily?
You voluntarily turn the light on.
I'm just saying......
Seriously, though, the dilation of the pupil is part of the autonomic nervous system, so beyond your conscious control.
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Re: Change your eye pupil size voluntarily?
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Re: Change your eye pupil size voluntarily?
Yes. I think most of that dark adaption occurs in the retina, not the pupil. But I wouldn't mind having some ability to consciously control my pupils. I mean, not that it could ever compare to being able to wiggle one's ears...KingNothing13 wrote: ↑Fri Sep 03, 2021 12:11 pm It would be nice to be dark adapted in a matter of seconds.....
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Re: Change your eye pupil size voluntarily?
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Re: Change your eye pupil size voluntarily?
You do get dark adapted, where pupil size is concerned, in seconds.KingNothing13 wrote: ↑Fri Sep 03, 2021 12:11 pm It would be nice to be dark adapted in a matter of seconds.....
But since 99% of dark adaptation occurs on the retina, not the pupil, it still takes 30-45 minutes to fully dark adapt, and some improvement is noted after 2 hours.
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Re: Change your eye pupil size voluntarily?
Those drops affect the small muscles that control the lens as well, so acuteness of vision goes down with their use.notFritzArgelander wrote: ↑Fri Sep 03, 2021 1:49 pm Well, now I'm wondering if any among us who might be ophthalmologists get naughty with those dilating drops?
But pupil size isn't really important in dark adaptation.
An 8mm pupil admits 4x the light of a 4mm pupil. Ooh, 4X.
But dark adaptation on the retina has been measured to be up to a 90,000x improvement in light sensitivity in a lab setting.
Even if it's only a third of that in the field, you can see that pupil diameter is NOT where dark adaptation occurs.
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Re: Change your eye pupil size voluntarily?
Yes, I know that dark adaptation happens at the retina. My question was whether anyone heard of folks who abused the drops. People do wacky things. I’ve heard of folks hyperventilating and overcaffeinating in an effort to squeeze a little more out of the retina, for instance.Don Pensack wrote: ↑Fri Sep 03, 2021 2:14 pmThose drops affect the small muscles that control the lens as well, so acuteness of vision goes down with their use.notFritzArgelander wrote: ↑Fri Sep 03, 2021 1:49 pm Well, now I'm wondering if any among us who might be ophthalmologists get naughty with those dilating drops?
But pupil size isn't really important in dark adaptation.
An 8mm pupil admits 4x the light of a 4mm pupil. Ooh, 4X.
But dark adaptation on the retina has been measured to be up to a 90,000x improvement in light sensitivity in a lab setting.
Even if it's only a third of that in the field, you can see that pupil diameter is NOT where dark adaptation occurs.
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Re: Change your eye pupil size voluntarily?
They didn't get back their acuity for many hours after the drops were administered.
And, of course, since we all have terrible astigmatism in the eye when the pupils are dilated to large sizes, even non-glasses wearers would find their vision wonky, needing astigmatism correction and possibly spherical as well.
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Re: Change your eye pupil size voluntarily?
Well, that doesn't sounds like fun at all.Don Pensack wrote: ↑Fri Sep 03, 2021 4:21 pm I have read of people who used the dilating drops in the field and found their vision blurred.
They didn't get back their acuity for many hours after the drops were administered.
And, of course, since we all have terrible astigmatism in the eye when the pupils are dilated to large sizes, even non-glasses wearers would find their vision wonky, needing astigmatism correction and possibly spherical as well.
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Re: Change your eye pupil size voluntarily?
Hey, I can do that rather well.AntennaGuy wrote: ↑Fri Sep 03, 2021 1:46 pm<snip> I mean, not that it could ever compare to being able to wiggle one's ears...KingNothing13 wrote: ↑Fri Sep 03, 2021 12:11 pm It would be nice to be dark adapted in a matter of seconds.....
No good deed goes unpunished.
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Re: Change your eye pupil size voluntarily?
Hey! Me too. I also have a devastating one-raised-eyebrow that has been described as "the basilisk's glance" by literary friends.John Fitzgerald wrote: ↑Fri Sep 03, 2021 5:50 pmHey, I can do that rather well.AntennaGuy wrote: ↑Fri Sep 03, 2021 1:46 pm<snip> I mean, not that it could ever compare to being able to wiggle one's ears...KingNothing13 wrote: ↑Fri Sep 03, 2021 12:11 pm It would be nice to be dark adapted in a matter of seconds.....
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Re: Change your eye pupil size voluntarily?
Keep calm and set SCE To AUX
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Re: Change your eye pupil size voluntarily?
I once asked my doc about getting them, he just laughednotFritzArgelander wrote: ↑Fri Sep 03, 2021 1:49 pm Well, now I'm wondering if any among us who might be ophthalmologists get naughty with those dilating drops?
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Re: Change your eye pupil size voluntarily?
Of course, it's well-known that pupil's dilate with sexual arousal.....much more pleasant than those awful eyedrops......just sayin
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Re: Change your eye pupil size voluntarily?
Ah, a passion for astronomy.
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