• Approximately 36 million people in the United States wear contact lenses to correct visual impairments, according to Children's Memorial Hospital in Chicago. Although federal law does not require your eye examiner to give you a copy of your contact lens prescription, you are certainly entitled to request one.

    Eye Curvature

    Unlike prescriptions for regular eyeglasses, contact lens prescription information must include the measurements of the curvature of each eye.

    Lens Power

    A contact lens prescription will contain the magnifying power of each lens. This power is measured in diopters. A diopter is often noted by a capital "D" in a prescription.

    O.D & O.S.

    O.D. on a contact lens prescription stands for oculus dextrus. It is referring to the right eye. Oculus sinister, or O.S., applies to the left eye.


    The numbers listed next to the word sphere indicate the degree of nearsightedness or farsightedness in each eye.


    The cylinder number represents the degree of astigmatism that is causing blurred vision.


    Childrens Memorial Hospital: Eyeglass prescription Eyeglass prescription

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