Open Veterinary Journal

Peer-Reviewed Journal

 

The eye of the Barbary sheep or aoudad (Ammotragus lervia): Reference values for selected ophthalmic diagnostic tests, morphologic and biometric observations

G.A. Fornazari1, F. Montiani-Ferreira1,*, I.R. de Barros Filho1, A.T. Somma1 and B. Moore2

1Universidade Federal do Paraná, Programa de Pós-Graduação em Ciências Veterinárias, Rua dos Funcionários 1540, 8035-050, Curitiba, PR. Brazil

2Veterinary Specialty Hospital of San Diego, 10435 Sorrento Valley Road, San Diego, CA 92121, USA

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Abstract

The purpose of this study was to describe the normal ocular anatomy and establish reference values for ophthalmic tests in the Barbary sheep or aoudad (Ammotragus lervia). Aoudad eyes are large and laterally positioned in the head with several specialized anatomic features attributed to evolutionary adaptations for grazing. Normal values for commonly used ophthalmic tests were established, Schirmer tear test (STT) - 27.22 ± 3.6 mm/min; Predominant ocular surface bacterial microbiota - Staphylococcus sp.; Corneal esthesiometry- 1.3 ± 0.4 cm; Intraocular pressure by rebound tonometry- 19.47 ± 3.9 mmHg; Corneal thickness- 630.07 ± 20.67 μm, B-mode ultrasonography of the globe- axial eye globe length 29.94 ± 0.96 mm, anterior chamber depth 5.03 ± 0.17 mm, lens thickness 9.4 ± 0.33 mm, vitreous chamber depth 14.1 ± 0.53 mm; Corneal diameter- horizontal corneal diameter 25.05 ± 2.18 mm, vertical corneal diameter 17.95 ± 1.68 mm; Horizontal palpebral fissure length- 34.8 ± 3.12 mm. Knowledge of these normal anatomic variations, biometric findings and normal parameters for ocular diagnostic tests may assist veterinary ophthalmologists in the diagnosis of ocular diseases in this and other similar species.

Keywords: Barbary sheep, Biometry, Ocular parameters, Wild caprid.

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Cite this paper:

Fornazari, G.A., Montiani-Ferreira, F., de Barros Filho, I.R., Somma, A.T. and Moore, B. 2016. The eye of the Barbary sheep or aoudad (Ammotragus lervia): Reference values for selected ophthalmic diagnostic tests, morphologic and biometric observations. Open Vet. J. 6(2), 102-113.