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How does the curvature measurement work for contact lenses?

For contact lenses, the base curve is the curve on the back surface of the lens. The curve on the back surface of soft lenses, including cosmetic lenses, should roughly approximate the curve on the clear front surface of your eye for maximum wearing comfort. Because the fit needs to be only approximate, most soft contact lenses are made in only two or three base curves. (For hard contact lenses, the back surface of the contact lens is custom made to exactly fit the clear front surface of the eye.) Any contact lens fitter can quickly and easily measure the curves on the front surfaces of your eyes and thereby advise you which available base curve would be best for you.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.