Vertex Calculator for Contact Lenses
Calculate vertex distance adjustments for contact lens prescriptions
Contact Lens Power
-
Power Change
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Practical Tips
- Higher powers require larger adjustments
- Verify comfort with trial lenses
- Consider corneal topography
- Monitor adaptation period
Reference Values
| Spectacle Power (D) | Vertex Distance (mm) | Typical Power Change | Notes |
|---|---|---|---|
| -2.00 | 12 | -0.25 | Minimal adjustment needed |
| -4.00 | 14 | -0.50 | Common prescription range |
| -8.00 | 16 | -1.00 | Significant adjustment required |