this post was submitted on 24 Sep 2023
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Why can't we decrease our eye's FPS to get better night vision? (feddit.de)
submitted 1 year ago* (last edited 1 year ago) by Pantherina@feddit.de to c/asklemmy@lemmy.ml
59 comments fedilink hide all child comments
 

My phone is normally worse for color gradients and contrasts than my eyes. Also, normally it has worse nightvision.

But when decreasing the shutter speed, for example in OpenCamera, I get crazy night pics.

I see that when its dark my FPS goes down, I see less frames automatically and totally cant control that.

Could this mechanism be altered, to have even less FPS but more photons in the soup to get brighter sight?

Yes, trying to hack my eyes here. "Getting used to darkness" is normally the pupils getting wider, there are quite some interesting plants to do that but I havent heard of anything altering the brains image processing.

Edit

I learned:

  • in Nightsight we use the rod cells, which take longer to send a signal. That way they capture more photons, but the "FPS" is lower
  • you can trick your iris naturally to stay open, like the Pirates did (some plants like nightshades also do this, applied locally)
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[โ€“] Chriszz@lemmy.world 5 points 1 year ago (4 children)

But cats have even faster sight. I think the avg reflex time for a cat is around 70-80ms while humans are over twice that. So it seems like their vision is entirely better. Why didnโ€™t our eyes evolve to be like theirs?

[โ€“] MentalEdge@sopuli.xyz 39 points 1 year ago* (last edited 1 year ago) (2 children)

Feline vision has drawbacks, and some adaptations we don't.

For one, cats have reflective eyes, rather than absorb light, that misses any cones/rods, cats reflect it back out, passing the light that comes into their eyes through their retinas twice. This improves how much of the light actually hits the light sensitive cones and rods in their eyes.

Second, cats have slitted pupils, this means they have a MASSIVELY larger range of light they can adjust to let into their eyes. Slitted pupils are able to close much tighter, and open much wider, than circular ones. If you've ever seen a cats eye in the dark, you know their pupils get HUGE. Several times that of humans.

As for a drawback, cat eyes suck at focusing. All cats are far-sighted. At less than about 20 cm, cats cannot see. All they get is a blurry mess. Ever wondered why your cat seems completely clueless when you set down a treat right in front of it? That's why.

This is why cats have whiskers. Close up, they go 100% by smell, hearing and feel!

[โ€“] nitefox@sh.itjust.works 2 points 1 year ago (1 children)

Are vampires just big kitties?

[โ€“] MentalEdge@sopuli.xyz 1 points 1 year ago (1 children)

Why is your account marked as a bot?

[โ€“] nitefox@sh.itjust.works 1 points 1 year ago (1 children)

... dunno?

[โ€“] MentalEdge@sopuli.xyz 1 points 1 year ago (1 children)

It's a checkbox you set in your user settings. Is it checked?

[โ€“] nitefox@sh.itjust.works 1 points 1 year ago (1 children)

it was. I'm not the smartest person alive so it checks out

[โ€“] MentalEdge@sopuli.xyz 1 points 1 year ago (1 children)

Ur still marked as a bot. Did you hit save after unchecking it?

[โ€“] nitefox@sh.itjust.works 1 points 1 year ago (1 children)

yep, it's deselected now

[โ€“] MentalEdge@sopuli.xyz 1 points 1 year ago

Ah, checked your profile from your instance, not a bot anymore, looks like it's just slow to update on mine.

[โ€“] 0_0j@lemmy.world 2 points 1 year ago

Woa... you just made me wee bit smarter with this

[โ€“] Norgur@kbin.social 7 points 1 year ago

Because our sight was never enotofna disadvantage that the humans with bad vision got killed off fast enough and the ones with better vision got to procreate more. Simple as that.

[โ€“] DogMuffins@discuss.tchncs.de 4 points 1 year ago

Well yeah, every animal has different features which make assist it to exploit whichever evolutionary niche it inhabits.

Maybe maintaining such fast reaction times just isn't possible with larger brains, or higher executive functions.