Objective:

To highlight the importance of base curve adjustments in fitting scleral contact lenses and their impact on visual outcomes.

Approach:

Key Findings:

• Base curve significantly influences the optical performance of scleral lenses.
• A steeper base curve can create excessive plus power in the tear reservoir, while a flatter curve can lead to excessive minus power.
• Improper base curve selection can result in midperipheral touch or excessive clearance.

Interpretation:

Careful consideration of base curve adjustments is crucial for optimizing scleral lens fit and visual clarity, especially in patients with complex corneal shapes.

Limitations:

• Achieving a 'textbook' fit may be impossible for complex corneas.
• Variations in clearance can still occur despite optimal base curve selection.

Conclusion:

Fine-tuning the base curve of scleral lenses is essential for improving visual outcomes and ensuring patient comfort.

Sources:

• Fisher et al, 2021
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