Which condition is identified as a bacterial infection of the eye?

Conjunctivitis is recognized as a bacterial infection of the eye, commonly referred to as "pink eye." This condition arises when the conjunctiva, which is the clear membrane covering the white part of the eye and the inner eyelids, becomes inflamed due to a bacterial infection. Symptoms often include redness, swelling, and discharge, which can be indicative of an infectious process.

Other conditions listed are associated with the eye but are not primarily bacterial infections. Blepharitis usually involves inflammation of the eyelids and can be caused by bacteria, but it is more about the eyelid margins than infection of the conjunctiva itself. Glaucoma is a group of diseases that damage the optic nerve and is related to increased intraocular pressure, rather than an infection. Cataracts involve clouding of the lens of the eye and are not caused by bacterial infection but rather through aging or other factors that lead to lens opacification.

Thus, among the provided choices, conjunctivitis is the only condition directly identified as a bacterial infection of the eye.