Which of the following is a common sign of Meibomian gland dysfunction?

Meibomian gland dysfunction (MGD) is characterized by abnormalities in the Meibomian glands that can lead to insufficient oil layer in the tear film, resulting in dry eye symptoms. A common sign of MGD is thickening of the eyelid skin, which occurs due to chronic inflammation and irritation. The repeated inflammation stimulates the proliferation of skin cells, leading to a noticeable thickening, also referred to as hypertrophy of the eyelid margins.

The other options do not accurately reflect the characteristics of MGD. Increased tear film stability is not typically a sign of Meibomian gland dysfunction; in fact, MGD often leads to decreased stability of the tear film due to inadequate lipid secretions. Thinning of eyelashes may be associated with various conditions but is not a classic sign of MGD. Clear tear production is also not a sign of dysfunction, as MGD usually leads to changes in the quality of tears, often resulting in a less stable tear film rather than clear production.