>>13298378There is a membrane of thick connective tissue preventing anything from getting "behind" your eye (if you pull down your lower eyelid really far you can see it as pale tissue, so no chance of
>>13299336. It probably fell out and you didn't notice. If there is no scratchy feeling, degradation of vision, pain, irritation or excessive tearing after a day or two - you're fine. Half the population would walk around teary eyed if your eyes couldn't flush out eyelids very reliably. If you do get an eyelid that just won't come out the best way to do it is to blink until it is over the white of your eye (not the iris, very important) and then get a clean q-tip, dip one side in clean water (never do it with a dry one) and then very gently touch the eyelid - it will stick in a few tries most times. If you don't manage to get it out, go have a doctor do it - there is a small, but non-zero, chance it can scratch your cornea before it comes out by itself.