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• Radius of Curvature
The radius of curvature formula is used to determine the radius of curvature from the material and the surface power of the lens.
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• Surface Power Formula
The surface power formula is used to determine the power of a surface from the material and the radius of curvature of that surface.
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• Flat Transposition
Flat transposition is used to change a prescription from minus cylinder to plus cylinder or from plus cylinder to minus cylinder.
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• Oblique Meridian Formula
The oblique meridian formula is used to find the approximate power of a lens in any meridian.
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• Compensated Power
The compensated power formula is used to determine what power of lens needs to be ordered when a high-power prescription is going to be worn at a different vertex distance than it was refracted at.
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• Future Formulas
These formulas are planned to be added in the future.
• Focal Length Formula
• Nominal Power Formula
• Optical Cross
• Cross Cylinder Transposition
• Spherical Equivalent
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