Tools & calculators

You want to deliver the best fit, comfort and visual acuity to all your patients who wear contact lenses. We’re here to help.


Take advantage of the tools and contact lens calculators below.* They’re designed to help you maximize fitting effectiveness, patient care and practice efficiency.

Spectacle Conversion Calculator

Easily convert a patient’s prescription for glasses to the corresponding contact lens parameters.

Efron Grading Scales

A standard clinical reference that helps quantify 16 contact lens wear-related anterior eye conditions.

* The calculators are designed to aid eye care practitioners. They are not a replacement for a professional contact lens fitting by a qualified eye care practitioner.