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Veterinary Ophthalmology
Article . 2025 . Peer-reviewed
License: CC BY
Data sources: Crossref
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PubMed Central
Article . 2025
License: CC BY
Data sources: PubMed Central
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Determination of Ophthalmic Parameters and Ocular Morphology in Ring‐Necked Parakeets ( Psittacula krameri )

Authors: Fernanda Taques Wendt; Fabiano Montiani‐Ferreira; Cecília Capacchi Dall’agnol; Franz Riegler Mello; Thiago Francisco Costa Solak; Breno Castello‐Branco Beirão; Marcello Machado; +1 Authors

Determination of Ophthalmic Parameters and Ocular Morphology in Ring‐Necked Parakeets ( Psittacula krameri )

Abstract

ABSTRACT Purpose To determine normal ophthalmic test values and to describe the ocular morphology of ring‐necked parakeets ( Psittacula krameri ). Materials and Methods 33 captive birds were examined, although not all tests were conducted on each bird. The tests included endodontic absorbent paper point tear test (EAPPTT), intraocular pressure (IOP), corneal touch threshold (CTT), central corneal thickness (CCT), palpebral and corneal diameters, ocular ultrasonography, and corneoconjunctival microbiota. The iris coloration of seven young parakeets was evaluated, and two macerated skulls were described. Results Normal values obtained were: EAPPTT: 7.57 ± 1.95 mm/min; IOP: 12.47 ± 1.51 mmHg; CTT: 2.46 ± 0.5 mm; CCT: 0.12 ± 0.006 mm; palpebral diameter: 8.04 ± 0.49 mm,; corneal diameter: 6.41 ± 0.49 mm. In ocular ultrasonography, the dimensions in the sagittal plane were: axial globe length (AGL): 0.94 ± 0.02 cm; vitreous chamber depth (VCD): 0.47 ± 0.02 cm; lens axial length (LAL): 0.32 ± 0.01 cm; anterior chamber depth (ACD): 0.1 ± 0.01 cm; pecten width (PW): 0.12 ± 0.02 cm, and pecten length (PL): 0.42 ± 0.04 cm. In the dorsal plane: AGL: 0.93 ± 0.03 cm; VCD: 0.47 ± 0.02 cm; LAL: 0.32 ± 0.03 cm; ACD: 0.1 ± 0.01 cm; PW: 0.32 ± 0.04 cm, and PL: 0.35 ± 0.03 cm. Microbiota analysis identified predominantly gram‐positive bacteria, with Staphylococcus sp. being the most common (47.5%). Anatomical evaluation of skulls revealed a large lacrimal process extending to the zygomatic process, and the margins of the processes intersect but do not fuse. Young parakeets exhibit a brownish iris that gradually turns blue by 60 days of age. Conclusion These findings may contribute to the diagnosis of ophthalmic conditions in this species and provide insight into normal anatomical features.

Related Organizations
Keywords

Male, Reference Values, Parakeets, Original Report, Animals, Female, Eye, Intraocular Pressure, Ultrasonography

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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