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Case report: what gives the myopic tilted disc an oval appearance?

机译：病例报告：什么使近视斜盘呈椭圆形？

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The optic disc has changed from the initial ( ) to the final ( ) visit. The distance from the fovea to the temporal margin of parapapillary atrophy was unchanged (white double arrows of same length), while the γ-zone was elongated. The horizontal diameter of this optic disc had been reduced to 0.772 of its original size. To account for the optic disc change of this patient, 39.5° of tilt by arccosine (0.772) was required. The curvatures along the Bruch’s membrane (linear lines) and anterior sclera (dotted lines) are drawn at both the initial (red lines) and final (blue lines) visits. The merged image ( ) shows that the degree of tilting or sloping of the optic nerve head (ONH) is negligible, while the majority of optic disc change is induced by the elongation of the scleral layer uncovered by the Bruch’s membrane: γ-zone parapapillary atrophy. The ONH tilt angle of initial and final visits were 5.4° and 9.8°, respectively, when measured by the method described in: Marsh-Tootle WL, Harb E, Hou W, Zhang Q, Anderson HA, Weise K, Norton TT, Gwiazda J, Hyman L: Optic Nerve Tilt, Crescent, Ovality, and Torsion in a Multi-Ethnic Cohort of Young Adults With and Without Myopia. 2017, 58(7):3158–3171
机译：光盘已从初始（）更改为最终（）访问。从中央凹到乳头旁萎缩的颞缘的距离没有改变（相同长度的白色双箭头），而γ-区拉长。该光盘的水平直径已减小到其原始大小的0.772。为了说明该患者的视盘改变，需要用反余弦（0.772）倾斜39.5°。在初始（红色线）和最终（蓝色线）访问时都绘制了沿Bruch膜的弯曲（直线）和前巩膜（虚线）。合并图像（）显示视神经头（ONH）的倾斜或倾斜程度可以忽略不计，而大部分视盘变化是由未覆盖的Bruch膜覆盖的巩膜层的伸长引起的：γ区乳头状萎缩。通过以下方法描述的方法进行测量时，初次访问和最终访问的ONH倾斜角分别为5.4°和9.8°：Marsh-Tootle WL，Harb E，Hou W，Zhang Q，Anderson HA，W​​eise K，Norton TT，Gwiazda J，海曼L：视神经倾斜，新月形，椭圆形和扭曲的多族裔年轻人（有或没有近视）。 2017，58（7）：3158–3171

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