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    Opposite prescriptions for glasses and contacts
    nessamorris posted:
    My contact prescription is:
    Sphere: +0.75, Cyl: -1.50, Axis: 90

    My glasses prescription is:
    Sphere: -0.50, Cyl: +1.25, Axis: 175

    Why are they so different? I don't wear both at the same time. I'm assuming it has do to with my astigmatism and the fact that my contacts are closer to my eyes, but it still seems strange to me to have one nearsighted prescription and one farsighted prescription.
    Alan M Kozarsky, MD responded:
    Glasses and contact lens prescriptions can be written in either the negative cylinder (your contact lens) or positive cylinder (your glasses) convention. Believe it or not, the two prescriptions are virtually equivalent but written in different formats.

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