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 |