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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-07-19 and was most recently seen on 2026-07-19.
Base curve radius (BCR) or simply base curve (BC) is the measure of an important parameter of a lens in optometry.
On a spectacle lens, it is the flatter curvature of the front surface.
On a contact lens it is the curvature of the back surface and is sometimes referred to as the back central optic radius (BCOR). Typical values for a contact lens are from 8.0 to 10.0 mm. The base curve is the radius of the sphere of the back of the lens that the prescription describes. This number is important in order to allow the contact lens to fit well to the wearer's cornea for comfort, to facilitate tear exchange, and to allow oxygen transmission.
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