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7. Meibum

If sebum gets in the eyes, it irritates them. Though glands do secrete sebum around the eyes, meibomian glands are designed to secrete meibum, rather than sebum, onto the surface of the eyes to prevent them from drying out. The composition of meibum is complex and, according to research, has a higher percentage of wax than lipids. There are between 20 and 40 meibomian glands on each lid.

meibomian meibum 7activestudio / Getty Images

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