Effect of optical defocus on performance of dogs involved in field trial competition

Ron Ofri, Steven R. Hollingsworth, Allyson Groth, Monica J. Motta, John H. Doval, Philip H. Kass, Christopher J. Murphy

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Objective-To measure the effect of induced myopia on field trial performance in dogs. Animals-7 Labrador Retrievers and 1 Chesapeake Bay Retriever trained in field trial competition. Procedures-Dogs were commanded to retrieve targets at 137.2 m (150 yards). Each dog participated in 3 trials while their eyes were fitted with 0- (plano), +1.50-, or +3.00-diopter (D) contact lenses, applied in random order. Retrieval times were measured objectively, and dog performances were evaluated subjectively by masked judges. Results-Retrieval times were significantly faster with plano lenses than with +1.50- or +3.00-D lenses, but there were no significant differences in times between +1.50- and +3.00-D lenses. Masked judges assigned the best performance scores to dogs with plano lenses and the lowest scores to dogs fitted with +3.00-D lenses. Conclusions and Clinical Relevance-Even mild myopic defocusing had a significant negative impact on both the subjective and objective assessments of dogs' performances. Dogs with demanding visual tasks or signs of visual deterioration should be evaluated retinoscopically to determine the refractive state because they may have ametropia.

Original languageAmerican English
Pages (from-to)546-550
Number of pages5
JournalAmerican Journal of Veterinary Research
Issue number4
StatePublished - Apr 2012


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