Surprised so many of them know those terms!

双眼皮 = double eyelid 单眼皮 = single eyelid 多眼皮 = multiple eyelid?

yep, as I know they do not have this saying like the multiple eyelids for native English speakers, jeje... that's chinese!

we call it double eyelid, single eyelid... don't know about the last one mutliple eyelids?