Yes the lenses do ‘disappear’ but they NEVER could go inside or behind the eye they are either stuck on the upper eyelid or scrunched into a corner of the eyelid, usually with LIGHT rubbing it will surface…but if its neatly in the top eyelid it may take longer to come out you may have to turn over eyelid a little to find it…usually some light rubbing works…if you are to harsh on your eyes they could get irritatd causing you not to be able to wear for a few hours and also the lens could tear.
but all in all its a good investment…you dont have to keep moving your head too see!