Purpose:
To investigate the difference of tear meniscus (TM) measurement between oculus keratograph 4 and optical coherence tomography (OCT), and to compare their repeatability.
Methods:
16 cases (32 eyes) with dry eye (DE) and 12 controls (24 eyes) were enrolled. Dry eye questionnaire was administered to all subjects. Tear break up time (BUT), Schemer I test and fluorescein staining of ocular surface were examined. The tear meniscus height (TMH) was measured 3 times respectively by oculus and OCT. The values determined by each technique were average for each eye and then statistically analyzed.
Results:
The average TMH value in DE group measured by oculus keratograph and OCT were 0.24±0.07mm and 0.25±0.08mm, both being significantly lower compared with 0.31±0.04mm and 0.32±0.12mm in the control group (P=0.000). TMH results were statistically significant difference between DE and control group (P=0.000). TMH values were both highly correlated in DE group (r=0.856) and control group (r=0.876).
Conclusions:
The fourth generation oculus keratograph 4 is an easy, quick, noninvasive, and reliable method to take TMH images and measurement, whose values significant correlated with OCT test results.
Keywords: cornea: tears/tear film/dry eye • imaging/image analysis: clinical • imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound)