Peer-reviewed veterinary case report
Two dogs with dilated pupils and eye nerve problems causing light
By Kanda, Teppei et al.·Published in The Journal of veterinary medical science·2010·Department of Veterinary Medicine, Japan·View original on PubMed →
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Original publication title: Mydriasis associated with local dysfunction of parasympathetic nerves in two dogs.
- Species:
- dog
Plain-English summary
A 5-year-old Miniature Dachshund and a 7-year-old Shih Tzu were both brought in for mydriasis (dilated pupils) and photophobia (sensitivity to light). During their exams, the vets found no other health issues, but the dogs' pupils did not respond normally to light. They used a special eye drop test to check the function of the nerves controlling the pupils, which confirmed that the problem was due to nerve dysfunction rather than an eye injury. With this diagnosis, the vets could better understand the cause of the dogs' symptoms and plan appropriate care.
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Abstract
In clinical practice, photophobia resulting from persistent mydriasis may be associated with dysfunction of ocular parasympathetic nerves or primary iris lesions. We encountered a 5-year-old Miniature Dachshund and a 7-year-old Shih Tzu with mydriasis, abnormal pupillary light reflexes, and photophobia. Except for sustained mydriasis and photophobia, no abnormalities were detected on general physical examination or ocular examination of either dog. We performed pharmacological examinations using 0.1% and 2% pilocarpine to evaluate and diagnose parasympathetic denervation of the affected pupillary sphincter muscles. On the basis of the results, we diagnosed a pupillary abnormality due to parasympathetic dysfunction and not to overt primary iris lesions. The test revealed that neuroanatomic localization of the lesion was postciliary ganglionic in the first dog.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/19996558/