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What is exactly a sph , cyl and axis in eye sight prescription?

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What is exactly a sph , cyl and axis in eye sight prescription?

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  1. The SPH, or SPHERE...is the correction for the farsightedness, or nearsightedness

    The CYL or CYLINDER is the correction for astigmatism

    The AXIS is the direction that the power of the Cylinder is ground at in the lens.

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