Is the mold curvature subtraction the lens power?

It is not the lens power that decreases the curvature of the mold. Mold curvature refers to the basic curvature of spectacle lens. It represents the degree of curvature or radius of curvature of the lens. Mold curvature is usually expressed by numbers, for example, symmetric mold curvature is 0, flat mold curvature is 2, and more curved mold curvature is 4 or higher. Lens power is a measure used to correct visual defects, also known as optical power or refractive power. Represents the severity of human vision problems, which are divided into myopia (negative number) and hyperopia (positive number), and the unit is "diopter" (d). Mold curvature is a measure to describe the shape of lens, and the lens degree is determined according to the individual diopter, which is not directly related to mold curvature.