NIKBUT
NIKBUT was measured twice in the right eye using the noninvasive K5M tear breakup time tool. The subjects were instructed to blink twice before screening and to keep their eyes open to the best of their ability when recording. The first NIKBUT (NIKBUT-1st) and NIKBUT average (NIKBUT-avg) were then automatically generated. The NIKBUT-1st indicates the time at which the tear film begins to break up. The NIKBUT-avg represents the average time at which the overall tear film breaks up [