You want to provide the best fit, comfort and visual acuity for all your patients that 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.

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Sphere Spectacle Conversion Calculator

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

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Efron Grading Scales

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

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Multifocal Calculator

Multifocal calculator makes the fitting process for presbyopic patients simpler and more efficient – helping you select lenses and save chair time.

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Toric Calculator

Toric calculator provides an efficient way to calculate and evaluate the recommended diagnostic toric contact lens for your astigmatic patient.


* 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.