AIM: To observe the agreement of the lower tear meniscus height(LTMH)measurements using RTVue XR and Keratograph ocular surface analyzer, and to compare intraobserver repeatability and interobserver reproducibility between the two devices in the virginal and FS-LASIK eyes.

METHODS: Totally 52 virginal eyes and 52 FS-LASIK eyes were included during January 2019 in Guangzhou Aier Eye Hospital. LTMH measurements were performed using RTVue XR and Keratograph Ocular Surface Analyzer. A paired t-test was used to compare the difference between LTMH values using the two devices. The with-subject standard deviation(Sw), test-retest repeatability(2.77Sw), coefficient of variation(CoV)and intraclass correlation coefficient(ICC)were calculated to evaluate the repeatability and reproducibility.

RESULTS: In the virginal eyes group, the average LTMH obtained with RTVue XR and Keratograph were 261.12±80.29μm and 235.05±78.40μm, respectively. CoV and ICC were 5.55% and 0.98 for RTVue XR, 14.90% and 0.87 for Keratograph, respectively. In the FS-LASIK group, the average LTMH were 234.55±68.38μm and 208.22±73.85μm, respectively. CoV and ICC were 5.29% and 0.97 for RTVue XR, 16.16% and 0.87 for Keratograph, respectively.

CONCLUSION: In the virginal and FS-LASIK eyes, the LTMH value obtained with RTVue XR is 25μm greater than Keratograph. RTVue XR has a better reliability than Keratograph and can be used to measure the LTMH.