Why are human eyes incredibly sensitive to nearly every stimuli but our eyelids can glide over them with no irritation?
In: Biology
It’s the same reason we don’t find the smell of oxygen to be totally nauseating – it’d make perfect sense, but animals with that trait wouldn’t last long, so we’ve adapted it out.
The inside of your eyelid is smooth, lubricated, and flexible. Eyes that can’t tolerate even that little irritation wouldn’t be very good at their job.
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