Typical values for a contact lens are from 8.0 to 10.0 mm. On a contact lens it is the curvature of the back surface and is sometimes referred to as the back central optic radius (abbreviated BCOR). On a spectacle lens, it is the flatter curvature of the front surface. ( June 2010) ( Learn how and when to remove this template message)īase curve radius, or simply base curve, abbreviated BCR or BC, is the measure of an important parameter of a lens in optometry. Please help to improve this article by introducing more precise citations. This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations.
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