How to Measure the Power & Diameter of Contact Lenses

 Contact lens prescriptions have different sizes and measurements. A contact lens has more components and information for correcting vision than a spectacle lens. During an eye exam for contact lenses, an eye doctor takes more measurements of the eye and uses this information to order individually designed lenses for each eye. The power and diameter of a contact lens are determined during a contact lens fitting and are sometimes changed during follow-up appointments or later as the eye and prescription change. Measuring a contact lens power and diameter is done in a few steps.

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