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Original Research

Nig. Vet. J.. 2017; 38(2): -


SONOGRAPHIC MEASUREMENTS OF SOME MAJOR OCULAR PARAMETERS OF INDIGENOUS NIGERIAN DOGS IN ZARIA

Hassan Abdullahi Audu, Sheriff Yusuf Idris, Ahmed Hamidu, Samuel Tanko Fadason, Maruf Lawal, Muazu Bappa.


Abstract

This study was aimed to conduct ophthalmic sonographic examination of Nigerian indigenous dogs to provide baseline information on some major ocular parameters, healthy eyes of eighty (80) indigenous dogs were used for the study. The dogs were adequately restrained by physically and the structure of the ocular globe was evaluated at a depth of 4-6 cm. For each dog, baseline data were obtained for corneal thickness (D1), anterior chamber depth (D2), lens thickness (D3), vitreous chamber depth (D4), and the axial length of the eye (D5). Similarly, the baseline data were obtained for anterior chamber area (A1), lens area (A2), vitreous chamber area (A3) and ocular globe area (A4). Result revealed that the baseline ocular parameters of the Indigenous Nigerian dogs’ (in puppy, adult and older dogs respectively) were D1: 1.2 ± 0.2 mm, 1.4 ± 0.2 mm, 1.8 ± 0.2 mm; D3: 12.6 ± 0.6 mm, 13.6 ± 0.8 mm, 15.1 ± 0.9 mm and D5: 39.1 ± 1.4 mm, 42.5 ± 1.5 mm, 43.2 ± 2.1 mm. similarly, area biometry were obtained for A1: 30.8 ±3.0 mm2, 34.5 ± 3.6 mm2 and 32.0 ± 4.6 mm2 and A2: 213.7 ± 21.1 mm2, 250.3 ± 23.6 mm2, 264.8 ± 21.0 mm2. It was observed that these values varied in two patterns: corneal thickness (D1), lens thickness and area (D3 and A2) and axial length and area (D5 and A4) increased with age from puppy to the adult and the older dogs in both sexes. However, the anterior chamber depth and area (D2 and A1) and vitrous depth and area (D4 and A3) increased initially with age from puppy to the adult dogs and then decreased slightly in the older dogs. The three (3) major ocular segments- anterior chamber, lens capsule and vitreous chamber was demonstrated in this study to represent approximately 2%, 17% and 76% respectively of the entire ocular globe area. The ciliary body and muscles, suspensory ligament and posterior chamber makes up the remainder 5%. This study has presented the baseline sonographic values of some major parameters of Indigenous Nigerian dogs in Zaria, and the values will be useful in the diagnosis ocular conditions that these may present.

Key words: Ultrasonography, Dog, Eye, dimensions/biometric readings, baseline






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