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Updated: Jan 30, 2026

A High Performance Impedance-based Platform for Evaporation Rate Detection
Published on: October 17, 2016
Assessment of tear-evaporation rate in thyroid-gland patients
Ali Abusharaha1, Abdulaziz A Alturki1, Saud A Alanazi1
1Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh 11433, Saudi Arabia, aabusharha@ksu.edu.sa.
Objective:
To assess the tear-evaporation rate in thyroid-gland patients using a VapoMeter.
Methods:
Twenty thyroid gland patients aged 18-43 years (mean 34.3±6.3 years) completed the study. Additionally, an age-matched control group of 20 patients aged 18-43 years (32.2±5.1 years) was enrolled in the study for comparison purposes. An Ocular Surface Disease Index dry-eye questionnaire was completed, followed by a test to determine the tear-evaporation rate using the VapoMeter. The test was performed three times per subject by the same examiner. Two readings were obtained each time.
Results:
Significant differences (P<0.05) were found between mean Ocular Surface Disease Index and tear-evaporation-rate scores within the study and control groups. The average tear-evaporation rate was much higher in the study group (median 41.2 [IQR 41.4] g/m2⋅h) than the control group (15.7 [13.7] g/m2⋅h). Moreover, the average Ocular Surface Disease Index score for thyroid-gland patients was much higher (15.6 [23.4]) compared to the control group (5.5 [7.50]).
Conclusion:
The tear-evaporation rate in thyroid-gland patients was found to be much higher than normal-eye subjects.
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