Missing "half" lenses

Once I put on my lenses  it started to hurt
 when I tacked off I only saw half of it

I thought that is way it hurt the other half must fell on the floor
   (especially that it stopped hurting  me)

I didn’t bother looking ( I was in hurry) so I put a new lenses and everything was ok

A week after I was washing my face when suddenly something came out of my eye

IT WAS HALF LENSES!