Convert Glasses Rx to Contact Lens Rx
The "Glasses Power" column indicates the power of your current glasses prescription. If you do not have a contact lens prescription, the Vertex Conversion Chart provided below is a helpful tool that eye doctors, opticians, para-optometric technicians, etc., use as part of the process of determining what power to use for your contact lenses. It can quickly convert your glasses prescription to a contact lens prescription.
| Vertex Conversion Chart | |
|---|---|
| Glasses Power (SPH) |
Contact Lens Power (SPH) |
| 0.00 ~ -4.00 | No change |
| -4.25 | -4.00 |
| -4.50 | -4.25 |
| -4.75 | -4.50 |
| -5.00 | -4.75 |
| -5.25 | -5.00 |
| -5.50 | -5.00 |
| -5.75 | -5.25 |
| -6.00 | -5.50 |
| -6.25 | -5.75 |
| -6.50 | -6.00 |
| -6.75 | -6.25 |
| -7.00 | -6.50 |
| -7.25 | -6.50 |
| -7.50 | -6.75 |
| -7.75 | -7.00 |
| -8.00 | -7.25 |
| -8.25 | -7.50 |
| -8.50 | -7.75 |
| -8.75 | -7.75 |
| -9.00 | -8.00 |
| -9.25 | -8.25 |
| -9.50 | -8.50 |
| -9.75 | -8.75 |
| -10.00 | -8.75 |
| -10.50 | -9.00 |
| -11.00 | -9.75 |