Refractive Error Prediction After Phacoemulsification Surgery: Lenstar LS 900 Versus Nidek AL-Scan

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Medical Devices

Background:

• Accurate intraocular lens (IOL) power calculation is crucial for successful cataract surgery outcomes.
• Optical biometry devices are essential tools for measuring ocular parameters needed for IOL calculations.
• Comparing the performance of different biometry devices is important for optimizing surgical planning.

Purpose of the Study:

• To compare the Lenstar LS 900 and Nidek AL-Scan optical biometry devices.
• Evaluate their accuracy in IOL calculation and refractive error prediction after phacoemulsification surgery.

Main Methods:

• Compared measurements of axial length (AL), keratometry (K1, K2, K-avg) between Lenstar LS 900 and Nidek AL-Scan.
• Assessed mean absolute error (MAE) and prediction error within ±0.50 D for both devices.
• Study included 105 eyes of 105 patients undergoing uncomplicated phacoemulsification.

Main Results:

• Lenstar LS 900 measured shorter AL and steeper keratometry values (K1, K2, K-avg) compared to Nidek AL-Scan (P < .001).
• Nidek AL-Scan demonstrated a significantly lower MAE (0.64 ± 0.60 D) than Lenstar LS 900 (0.74 ± 0.6 D) (P < .001).
• A higher percentage of eyes achieved prediction error within ±0.50 D with Nidek AL-Scan (61%) versus Lenstar LS 900 (49.5%) (P = .008).

Conclusions:

• Nidek AL-Scan provides more predictable IOL power selection outcomes compared to Lenstar LS 900.
• Despite clinical similarities in AL and K-avg, differences in IOL power selection exist between the devices.
• The findings suggest potential differences in refractive outcomes when using these two biometry devices.