Diopter Contact Lens Prescription

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• Frequently Asked Questions

• What is a diopter in contact lenses?

  Most terms on contact lens prescriptions are measured in diopters, a unit of refractive power that is equal to the reciprocal of the focal length in meters of a lens. Diopter is often abbreviated as D.

• What do the diopters on my Prescription mean?

  For glasses prescriptions, the diopters on your prescription such as -5.00 tells you how far your eyes can focus and therefore how much lens power is needed. It’s basically an inverse of the distance to your “edge of blur”.

• How many diopters of glasses prescription equal a contact lens prescription?

  Any prescription over -3.50 to -4 diopter, and add +0.25 diopters for every two diopters of increase: So a -4.00 glasses prescription is roughly equal to a -3.75 contact lens prescription.

• How do I Convert my Prescription to contact lenses?

  Any prescription over -3.50 to -4 diopter, and add +0.25 diopters for every two diopters of increase: So a -4.00 glasses prescription is roughly equal to a -3.75 contact lens prescription. Some advise starting conversion at -3.50.