Reliability of the drop test for the lacrimal drainage function

• Published in: Acta ophthalmologica Scandinavica Vol. 77; no. 4; pp. 381 - 385
• Main Authors: Sahlin, Sven, Chen, Enping, Philipson, Bo
• Format: Journal Article
• Language: English
• Published: Copenhagen, DK Munksgaard International Publishers 01.08.1999
• Subjects: Adolescent; Adult; Aged; Aged, 80 and over; Blinking - physiology; Child; Diagnostic Techniques, Ophthalmological; Female; Humans; Hyaluronic Acid - administration & dosage; Lacrimal Apparatus - drug effects; Lacrimal Apparatus - physiology; Male; Medicin och hälsovetenskap; Middle Aged; Ophthalmic Solutions - administration & dosage; Reproducibility of Results; Sodium Chloride - administration & dosage; Tears - secretion
• ISSN: 1395-3907; 1600-0420
• DOI: 10.1034/j.1600-0420.1999.770403.x

The purpose of this study was to investigate the reliability of the drop test. The repeatability of the test was studied with the same and three different examiners. The influence of the blink rate was investigated by recording the blink frequency in 63 subjects. The degree of reflex lacrimation during the test was assessed in ten patients. The effect of different test solutions was investigated in ten test subjects. There was no significant difference when the test was repeated either by the same or different examiners. The reflex lacrimation during the drop test was not significant. There was no correlation between drop test result and blink rate. A moderate increase in the viscosity of the test solution affected the lacrimal drainage. The drop test is a reliable test for the lacrimal drainage function.