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.

The tools and contact lens calculators below* are designed to help you maximise fitting effectiveness, patient care and practice efficiency.

Contact lens prescription calculator (OptiExpert)

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 calculator is designed to help eye care practitioners and is not a substitute for a professional contact lens fitting by a qualified eye care practitioner.