Table 1.

TF grades, PRT test results, TBUT values, and osmolarity values for patients with dry eye who received short-term vitamin A supplementation

Test	Before vitamin A	After vitamin A
TF*	2.4 (0.5)	1.4 (1.1)
PRT (mm)	27.9 (5.8)	30.7 (4.2)
TBUT (s)	7.8±3.3	8.8±4.5
Osmolarity* (mOsm/L)	293.0±8.9	303.0±9.3

Notes:

^*Statistically significant difference (P<0.05) between pre- and post-supplementation values. TF and PRT test values are presented as medians (interquartile ranges), while TBUT and osmolarity values are presented as mean ± SD.

Abbreviations: PRT, phenol red thread; TBUT, tear break-up time; TF, tear ferning.