What commonly used term refers to the phrase "pink-eye"?

The term that commonly refers to "pink-eye" is conjunctivitis. This condition involves inflammation of the conjunctiva, the thin, transparent membrane that lines the inside of the eyelids and covers the white part of the eyeball. Conjunctivitis can cause redness, itching, tearing, and a discharge, which contribute to the characteristic pink appearance of the eye. It can be caused by various factors, including viral or bacterial infections, allergens, or irritants.

In contrast, blepharitis is an inflammation of the eyelid margins, often associated with oil gland dysfunction and can lead to crusting and irritation of the eyelids, but it does not specifically cause the pink eye appearance. Keratitis involves inflammation of the cornea and presents with different symptoms, such as blurred vision and pain, and is not synonymous with pink-eye. A chalazion is a cyst formed from a blocked oil gland in the eyelid and does not cause conjunctival inflammation. Thus, conjunctivitis is the most accurate term used to describe the condition commonly known as pink-eye.