this post was submitted on 13 Nov 2023
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Chicks blink more than dudes and their eyelids aren't swoll, so I think I disagree with your premise.
Women's eyelids are the same as men's. If anything that just tells you that if you want to become swole you should add more weight, not more reps.
Wait, women also add weight to their eyelids in the form of fake eyelashes and they don't gain any bulk either. This might be a flawed premise.
They're clearly not adding enough weight.
You detect light to know when to wake up or something is happening. Totally blind people also have the mechanism and why they know when it is morning (unless they are missing the organ). I am sure there are other reasons.
Most blind people have some vision
Complete blindness is pretty rare I think
https://www.cdc.gov/visionhealth/vehss/estimates/vision-loss-prevalence.html
https://www.afb.org/blindness-and-low-vision/eye-conditions/low-vision-and-legal-blindness-terms-and-descriptions
Probably so you wake up when it’s light out
I'm now imagining falling asleep around a campfire, and there's... a shadow
My guess, we evolved in hot areas so would often rest during the hottest part of the day. When you're napping your brain can probably notice if a shadow blocks the light alerting you to a potential threat.
That's totally an uneducated guess though.
That's an interesting thought, but I would suggest it's the simple answer: the skin around your eyes is already fairly thin compared to areas that experience frictional forces more often such as the soles of your feet or palms of your hands, so your eyelid would also be a similar thickness to your face skin.
I don't think having thicker eyelids would be much of a disadvantage considering it's not readily visible so predators wouldn't know who's vulnerable like they do when hunting the young or injured, and since humans are social creatures any attack on one would alert the others via sound. Furthermore, how often would a threat cast a shadow over your face before it made itself known in other ways? Probably not enough to give an advantage to one-ply eyelid people to pass on thin genes over thick genes in enough of a way to cause human evolution to run that course.
It's possible, I just don't see it being likely. Like most traits, I think it's just random and has negligible impact on survival/reproduction meaning it doesn't change.
I could be wrong though