Most customers purchase color contact lenses according to the degree, while the size of the curvature is rarely considered.
The base arc refers to the curvature of the eyeball. The larger the base curve, the flatter the eyeball, the smaller the base arc, the more prominent the eyeball. Base arc does not mean a good thing or a bad thing, it just represents the shape of the eyeball, and It is an important reference when choosing the cheap color contacts.