OpticalToolbox

All Calculators

Professional optical calculation tools for opticians, students, and eye care practitioners.

Prism

Popular
Prentice's Rule
Calculate induced prism from lens decentration
Open Calculator
Popular
Prism Resolver
Combine or resolve prism components
Open Calculator

Lens Power

Popular
Lens Power
Calculate total lens power from front and back curves
Open Calculator
Lens Thickness
Estimate center and edge thickness of lenses
Open Calculator
Sag Formula
Calculate lens surface sag from radius and diameter
Open Calculator

Measurements

Popular
Minimum Blank Size
Calculate minimum lens blank size needed for frame
Open Calculator

Prescriptions

Popular
Vertex Distance
Compensate prescription power for different vertex distances
Open Calculator
Transposition
Convert plus cylinder to minus cylinder and vice versa
Open Calculator
Add Power
Calculate reading addition from working distance
Open Calculator
Spherical Equivalent
Calculate spherical equivalent of cylinder prescription
Open Calculator