So that normally shouldn’t happen, but there is some space between the eye and the eyelid that things like contacts and hairs can get stuck in. Things can’t go all the way around the eye in a normal person because there are things physically attached to your eye at the sides and back; muscles to move it, and your optic nerve, and various connective tissues that all come together to seal the inside of the skull off from the outside.
They actually come out of your eye socket, not disappearing behind your eye forever.
Look at this image and you’ll see that under the eyelids there is the space called the fornix. In real life this is filled with a layer of your tears so that your eyelids slide over you eye smoothly. But you can see it only goes so far back
https://i1.wp.com/entokey.com/wp-content/uploads/2022/06/f01-06-9780323757546.jpg?zoom=3&w=960
Other than lubricating the area so your eyelids smoothly move over your eye, the other big role of your tears is to catch dust and grit (and eyelashes that have fallen out and got caught in the area) and flush these out of the eye socket so they don’t injury the eye.
So for those times that you don’t see where that hair that’s been stuck in your eye has gone, it’s actually come out onto your skin and away without you seeing it. You’ve not got a little nest of lost hairs coiling up in your skull. Don’t worry
Btw, if you’ve ever got grit or something stuck in your eye, a fast way to get it out is to grip your upper eyelashes and gently pull them forward so your upper eyelid pulls forward away from eye. Then, still holding the upper lashes and lid in that position, blink several times. Let go of lashes and blink a few more times. When you have the upper lid pulled forward, the lashes from your lower lid brush out anything caught in the tears. This was taught to me by the lead ophthalmologist at a hospital I worked at. Works a dream
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