4.1 Article

Diurnal variation of the tear osmolarity in normal subjects measured by a new microchip system

Journal

EUROPEAN JOURNAL OF OPHTHALMOLOGY
Volume 22, Issue -, Pages S1-S4

Publisher

WICHTIG EDITORE
DOI: 10.5301/ejo.5000084

Keywords

Diurnal variation; Dry eye; Osmolarity

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PURPOSE. To show the diurnal variation of tear osmolarity in normal subjects. METHODS. Thirty volunteers were recruited. Tear osmolarity was measured with TearLab osmolarity system at 3-hour regular intervals between 8:00 AM and 5:00 PM. One-way analysis of variance test was used for statistical analysis. RESULTS. Thirty healthy volunteers (all men) with a mean age of 29.6 +/- 4.3 years (range 18-45) were recruited. The difference between measurements at 8:00 AM and 11:00 AM, 8:00 AM and 2:00 PM, 8:00 AM and 5:00 PM, 11:00 AM and 2:00 PM, 11:00 AM and 5:00 PM, and 2:00 PM and 5:00 PM were not statistically significant (one-way analysis of variance test, p>0.05). CONCLUSIONS. In normal subjects, tear osmolarity seems to have a stable profile during the daytime.

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