Sagitta Calculator
This tool is intended for educational and dispensing support use.
It calculates approximate sagitta from radius, surface power, and refractive index.
Summary Output
Enter the radius, surface power, and refractive index above, then submit the form.
How It Works
This version uses the approximate sagitta formula from the optics study guide.
Sagitta = (r² × D) / (2000 × (n − 1))
It is useful for practical lens-thickness estimation and for understanding how radius, surface power, and index affect curve depth.