OUTFLOW OF TEARS AND ITS INFLUENCE ON TEAR SECRETION AND BREAK UP TIME (B. U. T.)

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Abstract
Schirmer''s test showed that a retarded outflow of tears causes reduction of the tear secretion. The BUT was independent of the outflow of tears in patients with epiphora (119 eyes with mechanical obstruction, functional obstruction or normal passage). Mucomimetics prolonged the BUT and retarded the outflow of tears, whereas ointments reduce both the BUT and the outflow (74 eyes). The BUT was reduced when tears were absorbed by filter paper in Schirmer''s test, but remained uninfluenced by filter paper inserted in the fornix. The BUT was a valuable clinical test. It was the resultant of many different factors (tear volume, mucus, fat, etc.).

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