Ishida Tomoka, Jonas Jost B, Ishii Minami, Shinohara Kosei, Ikegaya Yoriko, Ohno-Matsui Kyoko
*Department of Ophthalmology and Visual Science, Tokyo Medical and Dental University, Tokyo, Japan; and †Department of Ophthalmology, Medical Faculty Mannheim, Ruprecht-Karls-University of Heidelberg, Mannheim, Germany.
Retina. 2017 Feb;37(2):299-304. doi: 10.1097/IAE.0000000000001165.
To visualize the arterial circle of Zinn-Haller (ZHAC) in highly myopic patients by using OCT-A.
Two hundred and fifty-three eyes of 146 consecutive patients with axial length ≥26.5 mm who underwent OCT-A centered onto the optic disk were studied.
Arterial circle of Zinn-Haller was detectable on OCT-A images within the area of the parapapillary myopic conus in 26 (10%) of 253 eyes. The ZHAC was annular in 18 (69%) eyes, triangular in (15%) 4 eyes, and irregular (15%) in 4 eyes. The visibility of the ZHAC on OCT-A images was similar to the visibility on indocyanine green angiograms and significantly better than on conventional fundus photos. Optical coherence tomography angiography visualized details of the ZHAC including the entry of the short posterior ciliary arteries into the circle up to the branches in direction to the optic nerve and ZHAC-associated cilioretinal arteries. In three eyes, the ZHAC was composed of multiple rings.
Noninvasive OCT-A allowed the visualization of ZHAC up to smaller vessel branches in 10% of highly myopic eyes. Because ZHAC is the main blood supply to lamina cribrosa of optic nerve, OCT-A-based assessment of ZHAC could become of interest in diseases such as glaucomatous optic neuropathy.
通过使用光学相干断层扫描血管造影（OCT-A）可视化高度近视患者的Zinn-Haller动脉环（ZHAC）。
对146例连续的眼轴长度≥26.5mm且接受以视盘为中心的OCT-A检查的患者的253只眼睛进行研究。
在253只眼中，有26只（10%）在视乳头旁近视性圆锥区域内的OCT-A图像上可检测到Zinn-Haller动脉环。ZHAC在18只（69%）眼中呈环形，4只（15%）眼中呈三角形，4只（15%）眼中呈不规则形。ZHAC在OCT-A图像上的可见性与吲哚菁绿血管造影上的可见性相似，且明显优于传统眼底照片。光学相干断层扫描血管造影显示了ZHAC的细节，包括短后睫状动脉进入环直至向视神经方向的分支以及与ZHAC相关的睫状视网膜动脉。在三只眼中，ZHAC由多个环组成。
无创性OCT-A能够在10%的高度近视眼中可视化ZHAC直至较小的血管分支。由于ZHAC是视神经筛板的主要血液供应，基于OCT-A对ZHAC的评估在青光眼性视神经病变等疾病中可能会变得有意义。
