A Comparison of Refractive Accuracy Between Conventional and Femtosecond Laser Cataract Surgery Techniques Using...

Area of Science:

• Ophthalmology
• Refractive Surgery
• Biomedical Engineering

Background:

• Cataract surgery aims for precise refractive outcomes.
• Femtosecond laser-assisted cataract surgery (FLACS) is an advanced technique.
• Optimizing intraocular lens (IOL) constants is crucial for accurate refractive predictions.

Purpose of the Study:

• To compare refractive outcome prediction accuracy between conventional (CCS) and FLACS.
• To evaluate the performance of modern IOL formulas with optimized constants for both techniques.

Main Methods:

• Retrospective analysis of 196 eyes (CCS) and 456 eyes (FLACS) with Acrysof IOL implantation.
• Optimized IOL constants were used to calculate predicted refractive outcomes.
• Prediction errors were compared against actual outcomes using various IOL formulas.

Main Results:

• No statistically significant difference in median absolute prediction error between CCS and FLACS across multiple IOL formulas (Kane, SRK/T, Holladay, Hoffer Q, Haigis, Barrett Universal 2, Holladay 2, Olsen).
• No consistent difference in the percentage of eyes within 0.25D, 0.50D, or 1.0D of the predicted refractive outcome for either technique.
• Both CCS and FLACS demonstrated comparable refractive predictability.

Conclusions:

• Refractive outcome prediction accuracy is similar for both conventional and femtosecond laser-assisted cataract surgery.
• The choice between CCS and FLACS does not significantly impact refractive predictability when using optimized IOL constants.
• This finding supports the use of either technique for achieving predictable refractive results in cataract surgery.