Curvature of the eyelash curl

Since the curvature of the eyelids varies from person to person, you need to determine your own curvature to find an eyelash curler that fits you. The reason your curler isn't gripping properly is likely because you are using one that doesn't match your eye's curvature. It is said that the larger the calculated curvature, the flatter the eye is. Most commercially available curlers have a curvature of approximately 16R to 22R. I hope you calculate your curvature and find the right curler for you.