Contact Lens Vertex Distance Calculator & Conversion Guide

This calculator helps convert spectacle prescriptions (glasses) to contact lens prescriptions by accounting for the vertex distance (the distance between the back surface of the lens and the front of the cornea).

Calculate Contact Lens Power

Result

This is the estimated contact lens power based on your input.

How to Use:

1. Enter your spectacle prescription’s sphere power in diopters (D)
2. The default vertex distance is 12mm (typical value)
3. Click “Calculate” to get the estimated contact lens power

Note:

This calculator provides an estimate only. Always consult with your eye care professional for accurate contact lens prescriptions.