That's also why certain contact lenses can't be worn overnight or for long periods of time because they aren't as breathable. At least that's what my eye doctor said when I got them.
this post was submitted on 25 Aug 2025
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Yep and if you wear them for too long your body will grow new blood vessels to supply your oxygen-starved eyes with what they need. These new blood vessels can cover your retina and can lead to blindness.
Learned that one by sleeping in daily disposable contacts for a while and losing a significant portion of my peripheral vision.
Oh damn, did not know that was a risk
They don't need oxygen when I'm sleeping?
You have a high concentration of blood vessels on the inside of your eyelids, which are kept in contact with the cornea by tears. It doesn’t only let oxygen through, some parts of blood (like lymph and antibodies) can also travel through the tears and into your cornea.
It is the only part of the body without a blood supply. Instead, it receives nutrients via aqueous humor (the liquid between the cornea and vitreous).
Instead, oxygen dissolves in tears and then diffuses throughout the cornea to keep it healthy.[5] Similarly, nutrients are transported via diffusion from the tear fluid through the outside surface and the aqueous humour through the inside surface.
And because that seemed lacking still and I’m too dumb to figure it out ChatGPT’s response:
The palpebral conjunctival blood vessels and the capillaries of the eyelids supply oxygen to the tear film behind closed lids. Oxygen diffuses from these vessels into the cornea.
My brother sleeps with his eyes party open. He must be eye oxygenmaxxing. Superior eyeballs.
So what you're saying is, my eyes are also lungs?
More like a giant alveolus. But inside out. With a giant sphincter in the middle. That poops light.
Boy, after getting a notification with this reply I had a hell of a time trying to figure out what I could have possibly said to spur it
Fun fact: your intestines are also lungs. Or maybe more accurately, lungs evolved from intestines. It turns out, you can oxygenate people by sticking an oxygen supply up their ass. Which is a possible treatment for people who have suffered respiratory failure.
Proof that I'm not just blowing hot air up your butt, except maybe I am: https://www.science.org/content/article/mammals-can-breathe-through-their-intestines
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That's crazy
Surely the oxygen and carbon dioxide also diffuse through the aqueus humor and surrounding sclera.
no no no, they gets oxygen supply from the back of your eyelids mostly (and also oxygen dissolved in you tears). otherwise you'd have to keep your eyes open when you sleep.
So that's why we're not supported to open our eyes under water. Our eyeballs are suffocating!
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Also your immune system will attack your eyes if it knows they're there. Eyes are weird.
Well that's just terrifying
Here's how fucked up it is imagine the only difference between having eyes and not having eyes is one tiny small area that if it breaks at any moment the immune system can "find" your eyes which is why eye damage needs to be treated right away. One tiny barrier keeps your eyes from being identified and if that breaks your worst nightmare.
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It'll do the same to a man's balls, too
As someone living with an eye injury, this is a deep seated fear.
New phobia unlocked
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So like ... Swim goggles will suffocate my eyes? 😦
Eventually, yeah. I had an issue with contacts when I was younger as I have to wear thick toric lenses, which allow very little oxygen through. I would wear them way too long, and I was warned that continuing to do so could cause eventually cause blindness
speak for yourself
10% of our regular oxygen intake is through the skin.
Source?
Mostly ocean flora but there's a lot that comes from the Amazon rainforest too.
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today I learned
i came, i saw, i absorbed oxygen directly from the air
read it up on cornea wikipedia, seems to be true :o
Instead, oxygen dissolves in tears and then diffuses throughout the cornea to keep it healthy.[5] Similarly, nutrients are transported via diffusion from the tear fluid through the outside surface and the aqueous humour through the inside surface.
What about buttholes?
They do have blood, as any ER doc could tell you.
However, they can also breathe in a manner of speaking. Enough that it's proposed as a possible method to keep someone alive if their lungs don't work.
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Lasic surgery first cuts the cornea leaving a little flap. The doc peals the eyeball then they shoot a laser beam in various places in a pattern to ablate the lens.
Then they put the flap back over like nothing happened, but that flat will never heal. That is why I will not be getting lasic thank you.
SMILE uses laproscopy, so the slit is only 3mm instead of 20mm for LASIK. Supposedly like a 3 day recovery time or maybe 2.
Also, does it really never heal?
Hmm I gotta look into that. Yup never heals.
There's a new thing where they have been able to reshape the lens by first acidifying it, then returning it to normal after massaging it into a new shape... Rabbit eyes so far, not human... Because rabbits can't scream like...like...like they were reshaping their eyeballs with acid.
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https://www.eyecenteroftexas.com/2019/06/does-corneal-flap-heal-lasik/
Why does this article from 2019 say otherwise?
Lol, they all say that, but when you read the fine print...."yes, the cornea does heal after LASIK. While the corneal flap may not fully "heal" in the sense of becoming completely indistinguishable from the surrounding tissue, it does reattach and become very stable."
It's like getting penis enlargement surgery buy then you get a warning afterwards.... It will fully heal, but just don't yank it too hard or hang from it for prolonged periods greater than half a second with a force equal or greater than 10 pounds. Levitra will also enlarge your left ear, which you should have trimmed to size every month by your local veterinarian.... WTF! No, my eyes are not little meat DSLR cameras to go mess around with. So I don't share the enthusiasm others do. I may indeed need a surgery in the future, but I'll postpone it.
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Wait, so what are the bliod vein things in the eyes if not supplying the eyes
They supply the rest of the eye. It's just the transparent bit on front that doesn't get much of anything.
how come when I don't blink it hurts and my eyes get red?
It means you're stoned af and forgot to blink
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