Effect of age, gender, weight, and time of day on tear production in normal dogs

Claudia Hartley; David L. Williams; Vicki J. Adams

doi:10.1111/j.1463-5224.2005.00437.x

Effect of age, gender, weight, and time of day on tear production in normal dogs

Claudia Hartley^*, David L. Williams, Vicki J. Adams

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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).

Original language	English
Pages (from-to)	53-57
Number of pages	5
Journal	Veterinary Ophthalmology
Volume	9
Issue number	1
DOIs	https://doi.org/10.1111/j.1463-5224.2005.00437.x
Publication status	Published - Jan 2006

Keywords / Materials (for Non-textual outputs)

Age
Dog
Gender
Keratoconjunctivitis sicca
Schirmer tear test
Time of day
Weight

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10.1111/j.1463-5224.2005.00437.x

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title = "Effect of age, gender, weight, and time of day on tear production in normal dogs",

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).",

keywords = "Age, Dog, Gender, Keratoconjunctivitis sicca, Schirmer tear test, Time of day, Weight",

author = "Claudia Hartley and Williams, {David L.} and Adams, {Vicki J.}",

year = "2006",

month = jan,

doi = "10.1111/j.1463-5224.2005.00437.x",

language = "English",

volume = "9",

pages = "53--57",

journal = "Veterinary Ophthalmology",

issn = "1463-5216",

publisher = "Wiley-Blackwell",

number = "1",

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TY - JOUR

T1 - Effect of age, gender, weight, and time of day on tear production in normal dogs

AU - Hartley, Claudia

AU - Williams, David L.

AU - Adams, Vicki J.

PY - 2006/1

Y1 - 2006/1

N2 - 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).

AB - 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).

KW - Age

KW - Dog

KW - Gender

KW - Keratoconjunctivitis sicca

KW - Schirmer tear test

KW - Time of day

KW - Weight

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DO - 10.1111/j.1463-5224.2005.00437.x

M3 - Article

C2 - 16409246

AN - SCOPUS:33644884448

SN - 1463-5216

VL - 9

SP - 53

EP - 57

JO - Veterinary Ophthalmology

JF - Veterinary Ophthalmology

IS - 1

ER -

Effect of age, gender, weight, and time of day on tear production in normal dogs

Abstract

Keywords / Materials (for Non-textual outputs)

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