Evaluation of a new IOLMaster algorithm to measure axial length

Area of Science:

• Ophthalmology
• Medical Devices
• Biomedical Engineering

Background:

• Cataract extraction requires precise preoperative measurements.
• Accurate axial length (AL) measurement is crucial for intraocular lens (IOL) power calculation.
• The IOLMaster with Advanced Technology version 5 software offers new measurement capabilities.

Purpose of the Study:

• To evaluate the efficacy of the IOLMaster version 5 software in measuring axial length (AL).
• To assess the performance of different AL measurement methods (standard, standard manipulated, composite-5, composite-20) within the software.
• To determine the impact of cataract characteristics on AL measurement success.

Main Methods:

• A single-center study involving 54 eyes from 33 patients undergoing cataract extraction.
• Axial length (AL) measurements were obtained using the IOLMaster with Advanced Technology version 5 software.
• Four analysis methods were applied: standard, standard manipulated, composite-5, and composite-20.

Main Results:

• The composite-5 and composite-20 methods achieved high success rates (92.6% and 96.3%) for AL measurement.
• Posterior subcapsular cataracts significantly impacted AL measurement success, particularly with standard and composite methods (P < .05).
• Measurement availability was significantly reduced in eyes with posterior subcapsular cataract of LOCS III grade 5.0 or higher.

Conclusions:

• The composite methods offer efficient and effective axial length (AL) measurement, comparable to the standard manipulated method.
• Over 90% of eyes were successfully measured using the composite methods.
• Dense posterior subcapsular cataracts pose a challenge for accurate AL measurement with both composite and standard manipulated methods.