“…Although differences in the mean value of the TMH have been reported in normal eyes, the measurement of TMH has been found to be useful in differentiating between normal, dry eye, and nasolacrimal duct obstruction subjects (Burkat and Lucarelli, 2005;Francis et al, 2005). Furthermore, TMH measurements have shown promising results in evaluating the efficacy of punctal occlusion in subjects with different forms of dry eye (Farrell et al, 2003).…”