At yesterday's checkup with the optometrist I discovered this is relevant to me — Dry Eye Disease 👁️ :

Meibomian Gland Dysfunction (MGD) is a widespread eye condition and the number one cause of Dry Eye Disease. There are 30-40 glands in each eyelid that produce the oily surface layer of your tears. If the glands get blocked or produce inadequate oil, the eyes feel irritated, sore and tired, and can appear red.