The front curve on a lens.

The meridian of least curvature on a cylindrical surface. It may be found on either the convex or concave side of a meniscus lens.

a number between 7.0 and 10.0 or a phrase, such as steep or flat, that describes the curvature of the eye

The basic curvature from which all other curves are determined in arriving at the final dioptic power.

A curve illustrating the relationship between I and V BE.