Fromhot eye makeup trendsto eye anatomy, we’re interested in it all.

This of course includes matters likewhat really causes hooded eyesandwhat really causes styes.

Naturally, eyes come in many shapes, too.

Close-up shot of a woman’s eye

One of the most fascinating parts of the eye, though, is the eyelid.

Ultimately, the difference between them isn’t too drastic, and it’s not harmful.

According toByrdie, the difference is the existence of a crease in double lids.

Close-up of woman staring into the distance

If you don’t see one, you likely have a monolid.

Eyelids, like many other traits on our faces, are tied to genetics.

According toVerywell Health, monolids are a recessive genetic trait.