Which bitoric fitting method is more commonly used clinically today?

Which bitoric fitting method is more commonly used clinically today?

• A. Saddle fit
• B. Low toric simulation
• C. High toric simulation
• D. Hybrid toric

Answer: (B)

In bitoric lens fitting, the amount of toricity built into the back surface is the key variable. Using a low toric simulation means adding only a modest amount of toric curvature, enough to align with the eye’s astigmatism but not so much that the lens becomes highly sensitive to rotation or difficult to center. This approach tends to be more forgiving and stable across a wide range of corneal toricity, making it easier to achieve a reliable fit in everyday clinical practice. It also benefits manufacturability and fitting efficiency, which is why it has become the most commonly used approach. Higher toric simulation aims to match the corneal toricity more aggressively, but that can lead to greater sensitivity to rotation, poorer centration, and more stringent fitting requirements, limiting its practicality in routine clinics. Saddle-style fits rely on a different back-surface geometry that can be effective in some eyes but often require more careful customization and can be less predictable across diverse corneas. Hybrid toric designs try to balance multiple features but add complexity that can reduce consistency and ease of fitting in many situations.

In bitoric lens fitting, the amount of toricity built into the back surface is the key variable. Using a low toric simulation means adding only a modest amount of toric curvature, enough to align with the eye’s astigmatism but not so much that the lens becomes highly sensitive to rotation or difficult to center. This approach tends to be more forgiving and stable across a wide range of corneal toricity, making it easier to achieve a reliable fit in everyday clinical practice. It also benefits manufacturability and fitting efficiency, which is why it has become the most commonly used approach.

Higher toric simulation aims to match the corneal toricity more aggressively, but that can lead to greater sensitivity to rotation, poorer centration, and more stringent fitting requirements, limiting its practicality in routine clinics. Saddle-style fits rely on a different back-surface geometry that can be effective in some eyes but often require more careful customization and can be less predictable across diverse corneas. Hybrid toric designs try to balance multiple features but add complexity that can reduce consistency and ease of fitting in many situations.