* The calculator is designed to aid eye care practitioners. It is not a replacement for a professional contact lens fitting by a qualified eye care practitioner.
Here's a handy tool for eye care practitioners! Use our Sphere Spectacle Conversion Calculator* to easily convert a patient's eyeglasses prescription to the corresponding contact lens parameters and use your expertise to make further refinements. Refer to our Toric or Multifocal calculators for other prescriptions.