Laramy-K Optical Lab - Lens Form: Sphere, Cylinder, and Axis

Laramy-K Optical Lab - Lens Form: Sphere, Cylinder, and Axis: "Practically speaking, the laboratory has a limited number of curve combinations with which to work. Lens blanks come from manufacturers with a limited selection of front curves, also known as base curves, with suggested power ranges for each. Furthermore, since aberrations occur as the eye moves away from the optical center of the lens, the lab will choose curves that minimize aberrations. Lenses with curves chosen to minimize aberrations are called 'corrected curve' or 'best form' lenses."