The effect of dacryocystorhinostomy on tear film flow and stability in patients with chronic dacryocystitis.

In 30 patients suffering from chronic dacryocystitis, tear film flow and stability were assessed by means of Schirmer I and break-up time tests before and after dacryocystorhinostomy. When compared with those of healthy individuals, mean values of Schirmer I tests were found to be decreased before dacryocystorhinostomy, but reached normal levels after a successful operation. Break-up time levels were found to be within normal limits before and after surgery and no statistically significant difference was observed between patients and control group. These findings not only confirm the previous findings, that tear secretion in patients with chronic dacryocystitis was reduced and break-up time was not affected, but also indicate that the reduction of tear secretion can be eliminated by a successful dacryocystorhinostomy.