This function converts the astigmatism data according to the magnitude and axis to a nominal classification of the variable as a function of the astigmatism orientation. It is possible to introduce the astigmatism in glasses so that a cylinder (-) with a 180º axis represents a WTR astigmatism or as a function of the maximum power meridian so that an astigmatism (+) at 90º represents a WTR astigmatism.
The function requires a variable with two columns
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