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What does it mean when SPH is written in the CYL box for my glasses presecription?

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What does it mean when SPH is written in the CYL box for my glasses presecription?

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  1. It's there to indicate that the first number, which *is* the sphere, is the only number in the Rx.

    It's a failsafe, making it clear that no further numbers (cyl, axis,) are missing due to copy error or oversight.


  2. It means there is no correction for astigmatism in the prescription.
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