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Intraocular pressure, ultrasonographic and echobiometric findings of juvenile Yacare caiman (Caiman yacare) eye

Authors

  • Thaís Ruiz,

    1. Department of Veterinary Clinic, College of Agronomy, Veterinary Medicine and Animal Sciences, Federal University of Mato Grosso, Cuiabá, MT, Brazil
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  • Wilma N. S. Campos,

    1. Department of Veterinary Clinic, College of Agronomy, Veterinary Medicine and Animal Sciences, Federal University of Mato Grosso, Cuiabá, MT, Brazil
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  • Thalita P. S. Peres,

    1. Department of Veterinary Clinic, College of Agronomy, Veterinary Medicine and Animal Sciences, Federal University of Mato Grosso, Cuiabá, MT, Brazil
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  • Gentil F. Gonçalves,

    1. College of Veterinary Medicine, Federal University of the South Frontier, Realeza, PR 182 KM 466, Brazil
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  • Rosa H. S. Ferraz,

    1. Department of Basic and Animal Sciences, College of Agronomy, Veterinary Medicine and Animal Sciences, Federal University of Mato Grosso, Cuiabá, MT, Brazil
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  • Pedro E. B. Néspoli,

    1. Department of Veterinary Clinic, College of Agronomy, Veterinary Medicine and Animal Sciences, Federal University of Mato Grosso, Cuiabá, MT, Brazil
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  • Valéria R. F. Sousa,

    1. Department of Veterinary Clinic, College of Agronomy, Veterinary Medicine and Animal Sciences, Federal University of Mato Grosso, Cuiabá, MT, Brazil
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  • Alexandre P. Ribeiro

    Corresponding author
    1. Department of Veterinary Clinic, College of Agronomy, Veterinary Medicine and Animal Sciences, Federal University of Mato Grosso, Cuiabá, MT, Brazil
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Abstract

Objective

The aim was to determine the intraocular pressure (IOP), the ultrasonographic and echobiometric findings in the eyes of juvenile Yacare caiman (Caiman yacare).

Animals

Twenty-two healthy caimans from a breeding farm in Brazilian Pantanal.

Procedures

Intraocular pressure was measured under physical restraint and topical anesthesia by applanation tonometry. Five individual measurements of each eye were recorded by the same examiner. B-mode ultrasonography was performed with a 10-MHz linear transducer, and the anterior chamber depth, lens thickness, vitreous depth, and axial globe length were measured. Unpaired and paired t-tests were used to assess data. Pearson's test was used to assess correlations between IOP and ocular structures (P < 0.05).

Results

Mean ± SD IOP of the 44 eyes studied was 9.56 ± 2.69 mmHg, (range 5.4–15.6 mmHg). IOP did not differ significantly between right and left eyes or between genders (P > 0.05). Echobiometric measurements did not differ significantly between eyes and genders (P > 0.05). Intraocular structures measured in male and female subjects were, respectively, 2.61 ± 0.13 and 2.55 ± 0.18 mm for anterior chamber depth, 7.60 ± 0.17 and 7.54 ± 0.20 mm for lens thickness, 6.83 ± 0.20 and 6.90 ± 0.22 mm for vitreous chamber depth, and 17.55 ± 0.25 and 17.54 ± 0.29 mm for axial globe length. Correlations were not observed (P > 0.05).

Conclusion

Reference values of tonometry and distances of intraocular structures of Yacare caiman were described. IOP did not correlate with echobiometric measurements in this crocodilian. The ultrasonographic appearance was similar to other domestic and wild species.

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