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Eye Care Professionals
For Eye Care Professionals
Fitting CalculatorProgressives Initial Lens Power Selection Tables
MYOPIA
Choose the equivalent Sphere Spectacle Refraction from the column on the left. The table values are compensated for vertex distance - no vertex conversions necessary. Then choose the Add from the top row.
| Sphere Spectacle Refraction | ADD | |||
| 1.00 to 1.25 | 1.50 | 1.75 to 2.25 | 2.50 to 3.00 | |
| 0.00 | 0.50 | 0.75 | 1.00 | 1.25 |
| -0.25 | 0.25 | 0.50 | 0.75 | 1.00 |
| -0.50 | 0.00 | 0.25 | 0.50 | 0.75 |
| -0.75 | -0.25 | 0.00 | 0.25 | 0.50 |
| -1.00 | -0.50 | -0.25 | 0.00 | 0.25 |
| -1.25 | -0.75 | -0.50 | -0.25 | 0.00 |
| -1.50 | -1.00 | -0.75 | -0.50 | -0.25 |
| -1.75 | -1.25 | -1.00 | -0.75 | -0.50 |
| -2.00 | -1.50 | -1.25 | -1.00 | -0.75 |
| -2.25 | -1.75 | -1.50 | -1.25 | -1.00 |
| -2.50 | -2.00 | -1.75 | -1.50 | -1.25 |
| -2.75 | -2.25 | -2.00 | -1.75 | -1.50 |
| -3.00 | -2.50 | -2.25 | -2.00 | -1.75 |
| -3.25 | -2.75 | -2.50 | -2.25 | -2.00 |
| -3.50 | -3.00 | -2.75 | -2.50 | -2.25 |
| -3.75 | -3.25 | -3.00 | -2.75 | -2.50 |
| -4.00 | -3.50 | -3.25 | -3.00 | -2.75 |
| -4.25 | -3.50 | -3.25 | -3.00 | -2.75 |
| -4.50 | -3.75 | -3.50 | -3.25 | -3.00 |
| -4.75 | -4.00 | -3.75 | -3.50 | -3.25 |
| -5.00 | -4.25 | -4.00 | -3.75 | -3.50 |
| -5.25 | -4.50 | -4.25 | -4.00 | -3.75 |
| -5.50 | -4.75 | -4.50 | -4.25 | -4.00 |
| -5.75 | -5.00 | -4.75 | -4.50 | -4.25 |
| -6.00 | -5.25 | -5.00 | -4.75 | -4.50 |
| -6.25 | -5.25 | -5.00 | -4.75 | -4.50 |
| -6.50 | -5.50 | -5.25 | -5.00 | -4.75 |
| -6.75 | -5.75 | -5.50 | -5.25 | -5.00 |
| -7.00 | -6.00 | -5.75 | -5.50 | -5.25 |
| -7.25 | -6.25 | -6.00 | -5.75 | -5.50 |
| -7.50 | -6.50 | -6.25 | -6.00 | -5.75 |
| -7.75 | -6.75 | -6.50 | -6.25 | -6.00 |
| -8.00 | -7.00 | -6.75 | -6.50 | -6.25 |
| -8.25 | -7.25 | -7.00 | -6.75 | -6.50 |
| -8.50 | -7.25 | -7.00 | -6.75 | -6.50 |
| -8.75 | -7.50 | -7.25 | -7.00 | -6.75 |
| -9.00 | -7.75 | -7.50 | -7.25 | -7.00 |
| -9.25 | -8.00 | -7.75 | -7.50 | -7.25 |
| -9.50 | -8.25 | -8.00 | -7.75 | -7.50 |
| -9.75 | -8.25 | -8.00 | -7.75 | -7.50 |
| -10.00 | -8.50 | -8.25 | -8.00 | -7.75 |
| -10.25 | -8.75 | -8.50 | -8.25 | -8.00 |
| -10.50 | -8.75 | -8.50 | -8.25 | -8.00 |
| -10.75 | -9.00 | -8.75 | -8.50 | -8.25 |
| -11.00 | -9.00 | -8.75 | -8.50 | |
HYPEROPIA
Choose the equivalent Sphere Spectacle Refraction from the column on the left. The table values are compensated for vertex distance - no vertex conversions necessary. Then choose the Add from the top row.
| Sphere Spectacle Refraction | ADD | |||
| 1.00 to 1.25 | 1.50 | 1.75 to 2.25 | 2.50 to 3.00 | |
| 0.00 | 0.50 | 0.75 | 1.00 | 1.25 |
| 0.25 | 0.75 | 1.00 | 1.25 | 1.50 |
| 0.50 | 1.00 | 1.25 | 1.50 | 1.75 |
| 0.75 | 1.25 | 1.50 | 1.75 | 2.00 |
| 1.00 | 1.50 | 1.75 | 2.00 | 2.25 |
| 1.25 | 1.75 | 2.00 | 2.25 | 2.50 |
| 1.50 | 2.00 | 2.25 | 2.50 | 2.75 |
| 1.75 | 2.25 | 2.50 | 2.75 | 3.00 |
| 2.00 | 2.50 | 2.75 | 3.00 | 3.25 |
| 2.25 | 2.75 | 3.00 | 3.25 | 3.50 |
| 2.50 | 3.00 | 3.25 | 3.50 | 3.75 |
| 2.75 | 3.25 | 3.50 | 3.75 | 4.00 |
| 3.00 | 3.50 | 3.75 | 4.00 | 4.25 |
| 3.25 | 3.75 | 4.00 | 4.25 | 4.50 |
| 3.50 | 4.00 | 4.25 | 4.50 | 4.75 |
| 3.75 | 4.25 | 4.50 | 4.75 | 5.00 |
| 4.00 | 4.75 | 5.00 | 5.25 | 5.50 |
| 4.25 | 5.00 | 5.25 | 5.50 | 5.75 |
| 4.50 | 5.25 | 5.50 | 5.75 | 6.00 |
| 4.75 | 5.50 | 5.75 | 6.00 | 6.25 |
| 5.00 | 5.75 | 6.00 | 6.25 | 6.50 |
| 5.25 | 6.00 | 6.25 | 6.50 | 6.75 |
| 5.50 | 6.25 | 6.50 | 6.75 | 7.00 |
| 5.75 | 6.50 | 6.75 | 7.00 | 7.25 |
| 6.00 | 7.00 | 7.25 | 7.50 | 7.75 |
| 6.25 | 7.25 | 7.50 | 7.75 | 8.00 |
| 6.50 | 7.50 | 7.75 | 8.00 | 8.25 |
| 6.75 | 7.75 | 8.00 | 8.25 | 8.50 |
| 7.00 | 8.25 | 8.50 | 8.75 | 9.00 |
| 7.25 | 8.50 | 8.75 | 9.00 | |
| 7.50 | 8.75 | 9.00 | ||
| 7.75 | 9.00 | |||
Initial Power = Spherical equivalent refraction (vertex corrected) + (spherical add/2)
e.g. SRx = -2.00 with +1.5 add gives a trial lens power of -1.25D
*Table values compensated for vertex distance. No vertex conversion necessary.
