Axial Length Measurement Failure Rates With Biometers Using Swept-Source Optical Coherence Tomography Compared to...

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optical Coherence Tomography

Background:

• Cataract surgery requires accurate axial length measurements for intraocular lens (IOL) power calculation.
• Existing biometry devices face challenges with dense cataracts, potentially impacting measurement accuracy.
• Swept-source optical coherence tomography (SSOCT) is an emerging technology for ocular biometry.

Purpose of the Study:

• To compare the performance of a new SSOCT biometer (OA-2000) against established devices (IOLMaster, Aladdin).
• To evaluate axial length measurement accuracy and failure rates across different cataract severities.

Main Methods:

• A reliability study involving 377 eyes from 210 patients.
• Randomized scanning with OA-2000, IOLMaster, and Aladdin biometers.
• Analysis of measurement failure rates and Bland-Altman limits-of-agreement for axial length.

Main Results:

• The OA-2000 demonstrated a 0% failure rate, significantly outperforming the IOLMaster (36.07%) and Aladdin (13.53%).
• Higher failure rates were observed with increasing cataract severity for all devices.
• Bland-Altman analysis showed close agreement between the OA-2000 and the other biometers.

Conclusions:

• The OA-2000 exhibits superior performance in measuring axial length in eyes with dense and complex cataracts.
• SSOCT technology shows promise for improving biometry accuracy in challenging cases.
• The OA-2000 may become the gold standard for axial length measurement in cataract surgery planning.