Prentice’s Rule Calculator
This tool is intended for educational and dispensing support use.
Use Prentice’s Rule to solve for induced prism, lens power, or decentration.
Summary Output
Enter values above, choose the quantity you want to solve for, and submit the form.
Prentice’s Rule
Prentice’s Rule relates lens power, decentration, and induced prism:
- Δ = (D × c) / 10
- D = (Δ × 10) / c
- c = (Δ × 10) / D
Where Δ is prism diopters, D is lens power in diopters, and c is decentration in millimeters.