The term 'Pupil Protector' refers to the various parts of the eye that protect the pupil from damage. The first part is the LID, which is a three-letter word for the upper and lower eyelids. The second part is the LASH, which is a four-letter word for the eyelashes. The third part is the CORNEA, which is a six-letter word for the transparent outer layer of the eye. Finally, the fourth part is the EYELID, which is also a six-letter word for the thin membrane that covers the eye. Together, these four parts form the Pupil Protector, which helps to keep the pupil safe from harm.