Which features distinguish Korean, Chinese, and Japanese eyes from each other?

The features that distinguish Korean, Chinese, and Japanese eyes from each other include the shape of the eyelids, the presence of an epicanthic fold, and the angle of the outer corners of the eyes. Korean eyes often have a double eyelid and a slight upward slant, Chinese eyes may have a single eyelid and a more pronounced epicanthic fold, while Japanese eyes typically have a subtle eyelid crease and a gentle downward slant.