This study was to investigate intraocular structures of canine absolute glaucomatous eyes using real time B-scan ultrasonography in accordance with the amplitude mode. Ten normal eyes and twenty absolute glaucomatous eyes were included in this study. Ocular biometry via closed-eye technique was performed usingthe Ultrascan®Imaging System (Alcon Surgical Laboratory,Fort Worth, USA), with a 10 MHz mechanical sector probe. Changes of intraocular structures were descriptively analyzed. Ocular biometry was measured, statistically analyzed and compared between both groups. While mean lens thickness was comparable betweennormotensive and glaucomatous eyes, mean lens equatorial length was higher in the latter group. Increased hyperechogenicity of lens was ultrasonographically observed in dogs with absolute glaucoma. Axial globe length was significantly greater in the experimental group than the control group (P<0.05). In relation to the appearance of the cone-shaped posterior wall, positive correlation between intraocular pressure and axial globe length with statistical significance was noted (r=0.5, P<0.05). Retinal detachment and lens displacement were also observed in absolute glaucomatous eyes. Not only does ultrasonography, with the 10 MHz frequency transducer, provides ocular biometry to specifically investigate changes of lens and the posterior segment of the canine absolute glaucomatous eyes, it can lead to further selection of appropriate treatment and awareness of post-treatment complications.
Faculty of Veterinary Science, Chulalongkorn University
Ngamrojanavanit, Napasorn; Tanthasathien, Natthaporn; Srisamai, Nirachon; Taotongnuntasin, Suchaya; Phoomvuthisarn, Panrawee; and Tuntivanich, Nalinee
"The use of B-scan coupling with A-scan ultrasonography to characterize ocular biometry in canine absolute glaucoma,"
The Thai Journal of Veterinary Medicine: Vol. 49:
3, Article 10.
Available at: https://digital.car.chula.ac.th/tjvm/vol49/iss3/10