Raptor Ophthalmology: The Ophthalmic Exam

Key Points

  • A complete ophthalmologic exam should be performed in all birds of prey admitted for medical attention.
  • Whenever possible, first observe the bird from a distance and thoroughly question the caretaker on food intake and flight habits.
  • All birds have some degree of striated muscle in their iris making the use of parasympatholytics (eg atropine tropicamide) ineffective. Fortunately pupils can usually be sufficiently dilated by simply darkening the room.
  • A slight degree of anisocoria can be a normal finding in raptors if the eyes are unevenly illuminated.
  • A true consensual pupillary light reflex is not detectable clinically.
  • Evaluate visual function and the bird’s ability to catch live prey before release back to the wild.

In many birds, the eye is the most important sensory organ, and even partial impairment of vision has far-reaching consequences. Unfortunately, ocular lesions are a common finding during ophthalmic examination in birds of prey . . .


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References

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Korbel R, Leitenstorfer P. The modified Schirmer tear test in birds—a method for checking lacrimal gland function. Tierarztl Prax A Usg K Klientiere Heimtiere 26(4): 284-294, 1998.

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Murphy CJ. Raptor ophthalmology. Compendium Small Animal 9(3): 241-260, 1987.

Pauli A, Klauss G, Diehl, K, Redig, P. Clinical techniques: considerations for release of raptors with ocular disease. J Exot Pet Med 16(2): 101-103, 2007.

Prashar A, Guggenheim JA, Erichsen JT, Hocking PM, et al. Measurement of intraocular pressure (IOP) in chickens using a rebound tonometer: quantitative evaluation of variance due to position inaccuracies. Exp Eye Res 85(4): 563-571, 2007.

Roze M. Comparative electroretinography in several species of raptors. Trans Am Coll Vet Ophthalmol 21: 45-48, 1990.

Willis AM, Wilkie DA. Avian ophthalmology Part 1: Anatomy, examination, and diagnostic techniques. J Avian Med Surg 13(3): 160-166, 1999.

To cite this page:

Pollock C, Murphy C. Raptor ophthalmology: The ophthalmic exam. January 6, 2010. LafeberVet Web site. Available at https://lafeber.com/vet/raptor-ophthalmology-the-ophthalmic-exam/