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

Langford Clinical Veterinary Service

Research output: Contribution to journal › Article (Academic Journal) › peer-review

123 Citations (Scopus)

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)	53-7
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 - 18 Jan 2006

Keywords

Age Factors
Animals
Body Weight/physiology
Circadian Rhythm
Dog Diseases/diagnosis
Dogs
Female
Keratoconjunctivitis Sicca/diagnosis
Male
Sex Factors
Tears/metabolism

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@article{47129e5069914c6fbb1da613fb60ca66,

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 Factors, Animals, Body Weight/physiology, Circadian Rhythm, Dog Diseases/diagnosis, Dogs, Female, Keratoconjunctivitis Sicca/diagnosis, Male, Sex Factors, Tears/metabolism",

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

year = "2006",

month = jan,

day = "18",

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

language = "English",

volume = "9",

pages = "53--7",

journal = "Veterinary Ophthalmology",

issn = "1463-5216",

publisher = "Wiley-Blackwell",

number = "1",

}

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 - 2006/1/18

Y1 - 2006/1/18

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 Factors

KW - Animals

KW - Body Weight/physiology

KW - Circadian Rhythm

KW - Dog Diseases/diagnosis

KW - Dogs

KW - Female

KW - Keratoconjunctivitis Sicca/diagnosis

KW - Male

KW - Sex Factors

KW - Tears/metabolism

U2 - 10.1111/j.1463-5224.2005.00437.x

DO - 10.1111/j.1463-5224.2005.00437.x

M3 - Article (Academic Journal)

C2 - 16409246

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

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