Which gland is primarily infected in a hordeolum?

A hordeolum, commonly known as a stye, is an acute inflammatory condition that occurs when a sebaceous (oil) gland in the eyelid becomes infected. The primary gland associated with a hordeolum is the Meibomian gland. These glands are located along the inner margin of the eyelids and play a crucial role in producing the oily layer of the tear film, which prevents evaporation of tears and maintains ocular surface health.

In cases of a hordeolum, the blockage of the Meibomian glands can lead to bacterial infection, resulting in the characteristic swelling, redness, and tenderness typically observed. The Meibomian gland's primary role and location in the eyelid anatomy make it the central focus during the development of hordeolum, further emphasizing its importance as the gland that is primarily infected.

Other glands mentioned, such as the conjunctival gland, lacrimal gland, and palpebral gland, have different functions in ocular health and tear production, and are not primarily involved in the infection process associated with hordeolum formation.