Vertex Distance Calculator
This tool is intended for educational and dispensing support use.
Use it to calculate binocular sphero-cylinder vertex compensation when exam and glasses vertex distances differ.
Summary Output
Enter binocular prescription and vertex distances above, then submit the form.
How It Works
This version follows the older binocular sphero-cylinder approach rather than a single scalar power conversion.
It compensates the sphere and the combined power in the cylinder meridian, then derives the new cylinder while keeping the original axis.
It is most relevant when the effective lens position changes enough to affect higher prescriptions.