Cottrill N B, Banks W J, Pechman R D
Department of Veterinary Anatomy, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803.
Am J Vet Res. 1989 Jun;50(6):898-903.
The normal B-scan ultrasonographic anatomic features of the eye and orbit of mesocephalic and dolichocephalic dogs were described. The B-scan appearance of ocular and orbital structures correlated well with the visual morphologic features of the specimens. The eyes of mesocephalic and dolichocephalic dogs were measured by use of ultrasonographic methods; those measurements were compared with direct measurements of the specimens. The 2-tailed Student t-test was used for all statistical analyses (P = 0.05). Measurements made included mid-cornea to anterior lens surface, lens thickness, vitreous body (posterior lens surface to retina), and axial globe length. The A-scan measurements of all 4 ocular distances were significantly different, compared with direct measurements. The B-scan measurements of mid-cornea to anterior lens surface, lens thickness, and vitreous body were significantly different from direct measurements; however, there was no significant difference between B-scan and direct measurements of axial globe length. There was no significant difference between A- and B-scan measurements. These findings suggest that A- and B-scan measurements are similar and that B-scan measurements are reasonably accurate for axial globe determination. Several variables were compared by B-scan and direct measurement methods. The axial globe length of dolichocephalic dogs was significantly longer than that of mesocephalic dogs. The axial globe length of male and female dogs was not significantly different in mesocephalic or dolichocephalic dogs. There was no significant difference in the axial globe length of right and left eyes in mesocephalic or dolichocephalic dogs.
描述了中脑型和长头型犬眼及眼眶的正常B超解剖特征。眼和眼眶结构的B超表现与标本的视觉形态特征密切相关。使用超声方法测量中脑型和长头型犬的眼睛；将这些测量结果与标本的直接测量结果进行比较。所有统计分析均采用双侧Student t检验（P = 0.05）。测量项目包括角膜中央至晶状体前表面、晶状体厚度、玻璃体（晶状体后表面至视网膜）和眼球轴长。与直接测量相比，所有4个眼距的A超测量结果均有显著差异。角膜中央至晶状体前表面、晶状体厚度和玻璃体的B超测量结果与直接测量有显著差异；然而，眼球轴长的B超测量与直接测量之间无显著差异。A超和B超测量之间无显著差异。这些发现表明，A超和B超测量结果相似，且B超测量在确定眼球轴长方面相当准确。通过B超和直接测量方法比较了几个变量。长头型犬的眼球轴长明显长于中脑型犬。中脑型或长头型犬中，雄性和雌性犬的眼球轴长无显著差异。中脑型或长头型犬左右眼的眼球轴长无显著差异。
