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Axial Length Measurement: PalmScan Versus IOLMaster.

Michael J Lipson1

  • 1Department of Ophthalmology and Visual Sciences, University of Michigan, Northville, MI.

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The handheld Micro Medical Devices (MMD) PalmScan offers a reliable and portable method for measuring axial length, showing high correlation with the IOLMaster. This convenient device is suitable for patient monitoring.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Accurate axial length measurement is crucial for refractive error correction and monitoring ocular growth.
  • The Carl Zeiss Meditec IOLMaster is a widely used, established device for axial length measurement.
  • Handheld, portable devices offer potential advantages in accessibility and ease of use.

Purpose of the Study:

  • To compare the accuracy and reliability of axial length measurements obtained with the handheld Micro Medical Devices (MMD) PalmScan against the gold standard Carl Zeiss Meditec IOLMaster.
  • To assess the correlation and agreement between the two devices across different subject groups.

Main Methods:

  • A study involving 60 subjects (120 eyes) was conducted.
  • Axial length was measured using both the IOLMaster and the MMD PalmScan by masked operators.
  • Subjects were categorized into three groups: overnight corneal reshaping wearers, soft contact lens wearers, and noncontact lens wearers.

Main Results:

  • Both devices demonstrated a high correlation in axial length measurements (overall correlation = 0.93, P < 0.001).
  • High correlations were maintained within each subject group (Group A: 0.94, Group B: 0.90, Group C: 0.98).
  • The MMD PalmScan consistently measured slightly shorter axial lengths compared to the IOLMaster (mean difference ± SD = 0.26 ± 0.42 mm).

Conclusions:

  • The Micro Medical Devices (MMD) PalmScan is a convenient, reliable, and portable device for measuring axial length.
  • Its high correlation with the IOLMaster suggests it is a viable tool for monitoring axial length in patients over time.