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I'm trying to purchase glasses online but I cannot figure out what the Spherical value is for the left eye (OS).

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I finally found this:

Plano - PL - This indicates there is no spherical correction in this eye. A plano lens would have no focusing power or correction to it.

So it's 0.

Source: How to Read and Enter Your Eyeglass Prescription - aclens.com.

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