Correction factor for ablation algorithms used in corneal refractive surgery with gaussian-profile beams

Area of Science:

• Ophthalmology
• Biomedical Optics
• Surgical Technology

Background:

• Photorefractive laser surgery utilizes Gaussian beams for corneal ablation.
• Current ablation algorithms may not fully account for pulse overlapping effects.
• Accurate prediction of post-surgical corneal geometry is crucial for visual outcomes.

Purpose of the Study:

• To introduce a correction factor for Gaussian beam ablation algorithms.
• To quantify the impact of pulse overlapping on laser surgery outcomes.
• To improve the accuracy of predicting post-surgical corneal radius and asphericity.

Main Methods:

• Developed a correction factor based on beam radius and spot size for Gaussian beams.
• Deduced expected post-surgical corneal radius and asphericity incorporating the factor.
• Analyzed data from 141 eyes undergoing LASIK (laser in situ keratomileusis) with Gaussian profiles.

Main Results:

• The correction factor significantly reduces discrepancies between experimental and predicted corneal power.
• Application of the factor led to more accurate estimations of post-surgical corneal parameters.
• Observed a notable improvement in the predictability of outcomes for LASIK procedures.

Conclusions:

• The proposed correction factor is essential for accurate ablation algorithms using Gaussian beams.
• Incorporating pulse overlapping effects enhances the predictability of corneal reshaping.
• This factor is recommended for improving post-surgical visual quality in laser refractive surgery.