HIGH ASTIGMATISMDecision-Making Process
Jessica Conroy OD, FAAO
High Astigmatism
Table 1: Decision-making table for High Astigmatism
| Corneal Astigmatism | Type of Corneal GP to Fit |
Considerations | Type of Bitoric GP to Fit |
| ≥2.50D | Bitoric | Difference in BCR = Difference in Power (± 0.50D) | Sphere Power Effect (SPE) |
| ≥2.50D | Bitoric | Difference in BCR ≠ Difference in Power (± 0.50D) | Cylinder Power Effect (CPE) |
| ≥2.50D | Back toric |
Difference in BCR ≠ Difference in Power (± 0.50D) AND Difference in Power = 1.5x Difference in BCR
|
Not Applicable
|