Eyelid crease
The fold in the upper eyelid that divides the lid into a lower part that moves and an upper part that does not.
Also: supratarsal fold, double eyelid
Many upper eyelids have a crease where a thin band of tissue from the lid-lifting muscle attaches to the skin, giving a fold a few millimetres above the lashes. In everyday speech in East Asia this is called a double eyelid. Lids without a visible crease are called monolids, and those where skin folds down over the crease are called hooded. Crease height and shape vary across people everywhere and can change with age.