Final answer:
The term Blepharitis specifically refers to inflammation of the eyelids and is the term from the options provided that involves a condition of the eyelid.
Step-by-step explanation:
The word that refers to a condition involving the eyelid is Blepharitis. Blepharitis is an inflammation of the eyelids. This condition can be caused by infections, allergies, or skin conditions and typically results in redness, swelling, itching, and potential scaling around the eyelids.
Other conditions such as Conjunctivitis involve the inflammation of the conjunctiva, Keratitis involves the inflammation of the cornea, and Glaucoma is a group of eye conditions that damage the optic nerve.