Refractive states of eyes and association between ametropia and breed in dogs

Melissa A. Kubai, Ellison Bentley, Paul E. Miller, Donald O. Mutti, Christopher J Murphy

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Objective - To assess the refractive state of eyes in various breeds of dogs to identify breeds susceptible to ametropias. Animals - 1,440 dogs representing 90 breeds. Procedures - In each dog, 1 drop of 1% cyclopentolate or 1% tropicamide was applied to each eye, and a Canine Eye Registration Foundation examination was performed. Approximately 30 minutes after drops were administered, the refractive state of each eye was assessed via streak retinoscopy. Dogs were considered ametropic (myopic or hyperopic) when the mean refractive state (the resting focus of the eye at rest relative to visual infinity) exceeded ± 0.5 diopter (D). Anisometropia was diagnosed when the refractive error of each eye in a pair differed by > 1 D. Results - Mean ± SD refractive state of all eyes examined was -0.05 ± 1.36 D (emmetropia). Breeds in which the mean refractive state was myopic (≤-0.5D) included Rottweiler, Collie, Miniature Schnauzer, and Toy Poodle. Degree of myopia increased with increasing age across all breeds. Breeds in which the mean refractive state was hyperopic (≥+0.5 D) included Australian Shepherd, Alaskan Malamute, and Bouvier des Flandres. Astigmatism was detected in 1% (14/1,440) of adult (≥ 1 year of age) dogs; prevalence of astigmatism among German Shepherd Dogs was 3.3% (3/90). Anisometropia was detected in 6% (87/ 1,440) of all dogs and in 8.9% (8/90) of German Shepherd Dogs. Conclusions and Clinical Relevance - Refractive states of canine eyes varied widely and were influenced by breed and age. In dogs expected to have high visual function (eg, performance dogs, determination of refractive state is recommended prior to intensive training.

Original languageEnglish (US)
Pages (from-to)946-951
Number of pages6
JournalAmerican Journal of Veterinary Research
Volume69
Issue number7
DOIs
StatePublished - Jul 2008
Externally publishedYes

Fingerprint

Refractive Errors
dog breeds
eyes
Dogs
dogs
breeds
Anisometropia
Astigmatism
German Shepherd
Canidae
Cyclopentolate
Tropicamide
Retinoscopy
Emmetropia
Play and Playthings
Collie
Rottweiler
Poodle (dog breed)
toys
Myopia

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Refractive states of eyes and association between ametropia and breed in dogs. / Kubai, Melissa A.; Bentley, Ellison; Miller, Paul E.; Mutti, Donald O.; Murphy, Christopher J.

In: American Journal of Veterinary Research, Vol. 69, No. 7, 07.2008, p. 946-951.

Research output: Contribution to journalArticle

Kubai, Melissa A. ; Bentley, Ellison ; Miller, Paul E. ; Mutti, Donald O. ; Murphy, Christopher J. / Refractive states of eyes and association between ametropia and breed in dogs. In: American Journal of Veterinary Research. 2008 ; Vol. 69, No. 7. pp. 946-951.
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abstract = "Objective - To assess the refractive state of eyes in various breeds of dogs to identify breeds susceptible to ametropias. Animals - 1,440 dogs representing 90 breeds. Procedures - In each dog, 1 drop of 1{\%} cyclopentolate or 1{\%} tropicamide was applied to each eye, and a Canine Eye Registration Foundation examination was performed. Approximately 30 minutes after drops were administered, the refractive state of each eye was assessed via streak retinoscopy. Dogs were considered ametropic (myopic or hyperopic) when the mean refractive state (the resting focus of the eye at rest relative to visual infinity) exceeded ± 0.5 diopter (D). Anisometropia was diagnosed when the refractive error of each eye in a pair differed by > 1 D. Results - Mean ± SD refractive state of all eyes examined was -0.05 ± 1.36 D (emmetropia). Breeds in which the mean refractive state was myopic (≤-0.5D) included Rottweiler, Collie, Miniature Schnauzer, and Toy Poodle. Degree of myopia increased with increasing age across all breeds. Breeds in which the mean refractive state was hyperopic (≥+0.5 D) included Australian Shepherd, Alaskan Malamute, and Bouvier des Flandres. Astigmatism was detected in 1{\%} (14/1,440) of adult (≥ 1 year of age) dogs; prevalence of astigmatism among German Shepherd Dogs was 3.3{\%} (3/90). Anisometropia was detected in 6{\%} (87/ 1,440) of all dogs and in 8.9{\%} (8/90) of German Shepherd Dogs. Conclusions and Clinical Relevance - Refractive states of canine eyes varied widely and were influenced by breed and age. In dogs expected to have high visual function (eg, performance dogs, determination of refractive state is recommended prior to intensive training.",
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