Non-invasive tear film break-up time
At baseline, non-invasive tear film break-up time was significantly shorter in DED eyes at an average of 10.1 s compared to 16.5 s in healthy eyes (Bland–Altman diagrams of non-invasive tear break-up time measurements. Each dot represents an average of two NIBUT first break measurements (in seconds, TOST of non-invasive tear break-up time measurements. The black square shows the mean difference of the two compared NIBUT measurements. The horizontal line shows the 96.8% confidence interval of the mean difference. The dashed vertical lines show the equivalence limits. Panels 