Spherical equivalent prediction analysis in intraocular lens power calculations using Barrett Universal II formula...

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optics

Background:

• Accurate intraocular lens (IOL) power calculation is crucial for successful cataract surgery outcomes.
• The Barrett Universal II (BUII) formula is a widely used tool for IOL power calculation.
• Variations in biometric parameters and axial length (AL) can affect refractive prediction accuracy.

Purpose of the Study:

• To evaluate the prediction accuracy of different Barrett Universal II (BUII) formula variations.
• To assess the impact of optional biometric parameters and sum-of-segments (SOS) axial length (AL) modification on IOL power calculation.
• To compare the performance of BUII formula variants across different axial length subgroups.

Main Methods:

• Retrospective analysis of 1340 eyes undergoing cataract surgery at a single academic center.
• Evaluation of five BUII formula variants: BUII LT, BUII WTW, BUII STD, BUII WØ, and BUII TAL (SOS AL adjusted).
• Analysis using a swept-source optical biometer (ARGOS), calculating spherical equivalent prediction error (SEQ-PE), standard deviation (SD), and accuracy.

Main Results:

• All BUII formula variations demonstrated high refractive accuracy.
• The BUII TAL variant showed superior precision and accuracy, particularly in short eyes (AL < 22.0 mm).
• BUII TAL and BUII STD achieved the highest percentage (80%) of eyes within ±0.50 D prediction error.

Conclusions:

• BUII formula variants provide excellent refractive prediction accuracy for IOL power calculation.
• The sum-of-segments (SOS) adjustment and optional biometric parameters significantly improve precision and accuracy, especially in short eyes.
• BUII TAL represents a valuable advancement for optimizing refractive outcomes in cataract surgery.