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• Decentration
This formula gives the distance needed to decenter a lens when edging.
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• Minimum Blank Size
The minimum blank size formula is used to determine if a single vision lens can be cut from a stock lens or must be surfaced.
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• Vogal's Formula
Vogal's formula is a guide used to determine front base curve for a prescription.
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• Approximate Sag Formula
The approximate sag formula gives a close enough figure for most jobs.
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• Future Formulas
These formulas are planned to be added in the future.
• Toric Transposition
• True Power
• Sagittal Depth
• Prism Thickness
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