Choosing Base Curves

By Brian Boddy, ABO-AC, Acoma Optical, Mark Mattison-Shupnick, ABOM
Tuesday, March 12, 2013 5:53 PM Base curves, we've learned are an effective way to provide adequate vision, over the entire lens, for a range of sphere and cylinder prescriptions.

Ophthalmic Lens Design

By Staff
Thursday, November 10, 2011 9:43 PM Take the CE course at

Lens Design

By Darryl Meister, ABOM
Thursday, November 10, 2011 9:03 PM The ability of a lens to refract and focus light—by either converging or diverging it—is referred to as its focal power or refractive power.

Base Curves

By Staff
Wednesday, November 09, 2011 11:55 PM The "best form" or "corrected curve" shape of a lens is one that provides as close to the the same vision at center and in the periphery as possible, as the eye moves normally behind the lens.

Base Curve Selection

By Darryl Meister, ABOM
Tuesday, November 08, 2011 9:25 PM The form of a given lens is determined by "base curve selection." The base curve of a lens is the surface curve that serves as the basis or starting point from which the remaining curves will be calculated.

Mechanical Factors of Lens Form

By Darryl Meister, ABOM
Tuesday, November 08, 2011 7:33 PM The maximum thickness of a lens, for a given prescription, varies with the form of a lens. Flatter lens forms are slightly thinner than steeper lens forms, and vice versa.

Optical Factors of Lens Forms

By Darryl Meister, ABOM
Monday, November 07, 2011 5:33 AM The principal impetus behind lens form selection is optical performance. Base curves are typically chosen to provide a wide field of clear vision.