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Reproducibility and repeatability of the OcuSense TearLab™ osmometer
Frank Eperjesi1, Maana Aujla, Hannah Bartlett
1Ophthalmic Research Group, School of Life and Health Sciences, Aston University, Birmingham, B4 7ET, UK. f.eperjesi@aston.ac.uk
Summary
The TearLab™ osmometer offers a reproducible and repeatable method for measuring tear osmolarity, a key indicator of dry eye syndrome. Changes smaller than 33 mOsms/l may represent measurement variability.
Area of Science:
- Ophthalmology
- Biomedical Engineering
Background:
- Increased tear osmolarity is a potential indicator of dry eye syndrome (DES).
- The OcuSense TearLab™ osmometer provides rapid, quantitative tear osmolarity measurements from small tear samples.
Purpose of the Study:
- To clinically evaluate the reproducibility and repeatability of the OcuSense TearLab™ osmometer.
Main Methods:
- Twenty-nine participants (aged 19-49 years) were enrolled.
- Tear osmolarity readings were obtained by two operators across two sessions, separated by 1-2 weeks.
Main Results:
- The coefficient of reproducibility was 39 mOsms/l.
- The coefficient of repeatability was 33 mOsms/l.
- The mean coefficient of variation was 2.9%.
Conclusions:
- The TearLab™ osmometer demonstrates acceptable reproducibility and repeatability.
- A change of 33 mOsms/l is suggested as a clinically relevant threshold for healthy subjects, distinguishing true changes from measurement noise.
