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.
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How to Use
- Enter your glasses prescription (sphere, cylinder, axis for each eye).
- Optionally adjust the vertex distance (default 12mm).
- View your estimated contact lens prescription.
Frequently Asked Questions
Why are glasses and contact lens prescriptions different?
Contact lenses sit directly on your eye, while glasses sit about 12mm away (vertex distance). This distance affects the effective power of the lens, especially for prescriptions above +/-4.00 diopters.
Is this converter accurate enough to order contacts?
This tool provides a good estimate, but you should always have your contact lens prescription verified by an eye care professional before ordering.
What is vertex distance?
Vertex distance is the distance from the back of a glasses lens to the front of your eye, typically about 12mm. It affects the effective power of the correction.
Does it handle astigmatism?
Yes. The converter adjusts both sphere and cylinder values for prescriptions with astigmatism.
Related Tools
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.