Claudia Hartley1, David L Williams, Vicki J Adams. 1. The Queens Veterinary School Hospital, University of Cambridge, Madingley Road, Cambridge CB3 OES, UK. claudia.hartley@aht.org.uk
Abstract
OBJECTIVE: To investigate the effects of age, weight, gender, and of time of day on tear production in normal dogs. ANIMALS: studied One hundred ophthalmoscopically and systemically unremarkable dogs. PROCEDURE: Schirmer tear tests (STT) were performed every 2 h during the day on one randomly chosen eye of each of 100 dogs. RESULTS: There was a statistically significant effect of time of day and age on the STT measurement. The mean STT decreased by 0.4 mm for every 1 year that age increased (P=0.007). Mean STT values taken at 10:00 am were 0.7 mm lower than values taken at 4:00 pm (P=0.04). CONCLUSIONS: Tear production decreases with age in the normal dog. In this population of dogs the largest difference was between the 10:00 am and the 4:00 pm STT measurements, but this still only amounted to 0.7 mm. This value is unlikely to be of clinical significance in the diagnosis of keratoconjunctivitis sicca (KCS).
OBJECTIVE: To investigate the effects of age, weight, gender, and of time of day on tear production in normal dogs. ANIMALS: studied One hundred ophthalmoscopically and systemically unremarkable dogs. PROCEDURE: Schirmer tear tests (STT) were performed every 2 h during the day on one randomly chosen eye of each of 100 dogs. RESULTS: There was a statistically significant effect of time of day and age on the STT measurement. The mean STT decreased by 0.4 mm for every 1 year that age increased (P=0.007). Mean STT values taken at 10:00 am were 0.7 mm lower than values taken at 4:00 pm (P=0.04). CONCLUSIONS: Tear production decreases with age in the normal dog. In this population of dogs the largest difference was between the 10:00 am and the 4:00 pm STT measurements, but this still only amounted to 0.7 mm. This value is unlikely to be of clinical significance in the diagnosis of keratoconjunctivitis sicca (KCS).
Authors: Fabio Leonardi; Giovanna Lucrezia Costa; Alice Stagnoli; Elena Zubin; Paolo Boschi; Alberto Sabbioni; Barbara Simonazzi Journal: Can Vet J Date: 2019-01 Impact factor: 1.008
Authors: A Willems; D Paepe; S Marynissen; P Smets; I Van de Maele; P Picavet; L Duchateau; S Daminet Journal: J Vet Intern Med Date: 2016-10-17 Impact factor: 3.333