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Eye Prescription Tools
Convert between eyeglass and contact lens prescriptions with vertex distance calculations.
3 tools available
Glasses to Contacts Prescription
Convert your eyeglasses prescription to contact lens values using vertex distance adjustment. Accounts for sphere and cylinder power changes at different distances.
Contacts to Glasses Prescription
Convert your contact lens prescription back to eyeglasses values. Applies reverse vertex distance adjustment for accurate spectacle lens power.
Eye Prescription to 20/20 Scale
Convert your eye prescription (diopter sphere power) to the approximate Snellen 20/xx equivalent. See what your uncorrected vision would be on the familiar 20/20 scale.