That clear plastic piece is called a conformer, and although it is very important and needs to be put back in, it is not something to be afraid of. The conformer was placed in the socket after the eye was removed. It allows the socket to heal and form a space for the artificial eye, or prosthesis, to be inserted. It is not unusual for a conformer to come out or for your child to take it out. However, it is very important that it is placed back into the socket as soon as possible.