Vertex Power Conversion
For spectacle Rx at 12mm vertex distance
Quick Calculator
Enter your spectacle power to get the equivalent contact lens power.
| Rx | - (Minus) | + (Plus) |
|---|---|---|
| 4.00 | -3.87 | +4.25 |
| 4.25 | -4.00 | +4.50 |
| 4.50 | -4.25 | +4.75 |
| 4.75 | -4.50 | +5.00 |
| 5.00 | -4.75 | +5.25 |
| 5.25 | -5.00 | +5.62 |
| 5.50 | -5.12 | +5.87 |
| 5.75 | -5.37 | +6.12 |
| 6.00 | -5.62 | +6.50 |
| 6.25 | -5.75 | +6.75 |
| 6.50 | -6.00 | +7.00 |
| 6.75 | -6.25 | +7.37 |
| 7.00 | -6.50 | +7.62 |
| 7.25 | -6.62 | +8.00 |
| 7.50 | -6.87 | +8.25 |
| 7.75 | -7.12 | +8.50 |
| 8.00 | -7.25 | +8.87 |
| 8.25 | -7.50 | +9.12 |
| 8.50 | -7.75 | +9.50 |
| 8.75 | -8.00 | +9.75 |
| 9.00 | -8.12 | +10.12 |
| 9.25 | -8.37 | +10.37 |
| 9.50 | -8.50 | +10.75 |
| 9.75 | -8.75 | +11.00 |
| 10.00 | -8.87 | +11.37 |
| 10.25 | -9.12 | +11.75 |
| 10.50 | -9.37 | +12.00 |
| 10.75 | -9.50 | +12.37 |
| 11.00 | -9.75 | +12.75 |
| 11.25 | -9.87 | +13.00 |
| 11.50 | -10.12 | +13.50 |
| 11.75 | -10.25 | +13.75 |
| 12.00 | -10.50 | +14.00 |
| 12.25 | -10.62 | +14.37 |
| 12.50 | -10.87 | +14.75 |
| 12.75 | -11.12 | +15.00 |
| 13.00 | -11.25 | +15.50 |
| 13.25 | -11.50 | +15.75 |
| 13.50 | -11.62 | +16.12 |
| 13.75 | -11.87 | +16.50 |
| 14.00 | -12.00 | +16.75 |
| 14.25 | -12.12 | +17.25 |
| 14.50 | -12.37 | +17.50 |
| 14.75 | -12.50 | +18.00 |
| 15.00 | -12.75 | +18.25 |
| 15.25 | -12.87 | +18.75 |
| 15.50 | -13.00 | +19.00 |
| 15.75 | -13.25 | +19.37 |
| 16.00 | -13.50 | +19.75 |
| 16.25 | -13.62 | +20.25 |
| 16.50 | -13.75 | +20.50 |
| 16.75 | -14.00 | +21.00 |
| 17.00 | -14.12 | +21.50 |
| 17.25 | -14.25 | +21.75 |
| 17.50 | -14.50 | +22.25 |
| 17.75 | -14.62 | +22.50 |
| 18.00 | -14.75 | +23.00 |
| 18.25 | -15.00 | +23.50 |
| 18.50 | -15.12 | +23.75 |
| 18.75 | -15.25 | +24.25 |
| 19.00 | -15.50 | +24.75 |
| 20.00 | -16.00 | +26.00 |