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The prescription you received from the eye specialist contains a number of values.

The SPH (S or power) value represents the correction for myopia, indicated by a minus (-), or hypermetropia, indicated by a plus (+). Check this page for more information on the difference between long-sightedness and short-sightedness.

CYL (C or cylinder) and AXI (A or axis) correct astigmatism, which occurs when your cornea is not completely round, but shaped somewhat like a rugby ball. AXI and CYL belong together: CYL is the amount of astigmatism, AXI is the axis, a number between 1 and 180.

Can't figure it out? Read more here.