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Base curve radius

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Base curve radius, abbreviated BCR or BC, is a parameter of a contact lens. Typical values are from 8.0 to 10.0 mm. The base curve is the radius of the sphere of the back of the contact lens that the prescription describes. Contact lenses must fit well to the wearer's cornea in order to be comfortable and to facilitate tear exchange and oxygen transmission.

In everyday practice, if contact lenses feel "loose" and slide easily a smaller base curve may work better. A large base curve may be needed if they feel tight. Lenses with smaller base curves are referred to as "steep".

Base Curve

Base curve is the measure of the general shape of a lens in optometry. On a spectacle lens, it is the flatter curvature of the front surface and on a contact lens it is the curvature of the back surface.

See also

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