What is the function of Moll glands?

Moll glands play an important role in maintaining the health and functionality of the eyelid. Specifically, these glands are responsible for secreting oil, which is essential for the formation of the protective lipid layer of the tear film. This oil helps prevent tear evaporation and maintains moisture in the eyes, contributing to overall eye comfort.

While other types of glands, like sebaceous glands, also secrete oil and may confuse some, Moll glands are specifically located at the margins of the eyelids and are classified as modified sweat glands. Their oil secretion is crucial in facilitating smooth eyelid movement and protection of the eye surface from environmental irritants.

The other functions mentioned in the options pertain to different glands or structures. For instance, tears are produced by the lacrimal glands, and sweat is produced by sweat glands, which are not linked to the function of Moll glands. Lastly, eyelid movement is primarily controlled by muscular actions rather than secretory functions of the Moll glands. All of these details re-emphasize why the role of Moll glands in oil secretion is a defining characteristic of their function.