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A new portable digital meniscometer.

Stefan Bandlitz1, Christine Purslow, Paul J Murphy

  • 1*MS, MCOptom †PhD, MCOptom ‡PhD, FCOptom, FAAO §PhD, FAAO ∥MD School of Optometry and Vision Sciences, Cardiff University, Cardiff, Wales, United Kingdom (SB, HP), Cologne School of Optometry, Cologne, Germany (SB), School of Health Professions, Plymouth, United Kingdom (CP), School of Optometry and Vision Science, University of Waterloo, Waterloo, Canada (PJM), Dr Heiko Pult - Optometry and Vision Research, Weinheim, Germany (HP) and Nuffield Laboratory of Ophthalmology, University of Oxford, Oxford, United Kingdom (AJB).

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Summary
This summary is machine-generated.

A new portable digital meniscometer (PDM) accurately measures tear meniscus radius (TMR) and is comparable to existing videomeniscometers. This device is suitable for clinical and research use in ophthalmology.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optometry

Background:

  • Tear meniscus radius (TMR) is a key indicator of ocular surface health.
  • Accurate and repeatable measurement of TMR is crucial for diagnosing and managing dry eye disease.
  • Existing videomeniscometers (VM) provide reliable TMR measurements but can be cumbersome.

Purpose of the Study:

  • To develop and validate a novel portable slit-lamp mounted digital meniscometer (PDM).
  • To assess the accuracy and repeatability of the PDM in comparison to the established Yokoi et al. videomeniscometer (VM).

Main Methods:

  • A new PDM utilizing a smartphone application was developed for reflective meniscometry.
  • In vitro accuracy was tested using glass capillaries of known radii.
  • In vivo repeatability and agreement were assessed by measuring TMR in normal subjects using both PDM and VM.

Main Results:

  • The PDM demonstrated high accuracy and repeatability in vitro, comparable to the VM.
  • In human subjects, PDM and VM measurements of TMR were highly correlated (r = 0.940, p < 0.001).
  • No statistically significant difference was found between TMR measurements obtained by PDM and VM in vivo (p = 0.124).

Conclusions:

  • The novel PDM is an accurate and reliable instrument for measuring tear meniscus radius.
  • The PDM provides comparable results to the existing VM in human subjects.
  • This portable device is well-suited for both clinical practice and research applications in ophthalmology.