Conversion Charts
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Diopter to Radius Conversion Chart
A single page chart and instructions on converting diopters to radius of curvature in millimeters. -
Vertex Conversion Chart
A single page chart vertexing plus and minus powers. -
Extending the Keratometer Range
A single page chart and instructions on extending the range of your Keratometer. -
Base Curve to EQ Conversion Chart
A link to a Base Curve/EQ Conversion chart useful when fitting Lifestyle GP multifocal lenses.