Williamson T H, Baxter G M, Dutton G N
Tennent Institute of Ophthalmology, Western Infirmary, Glasgow, UK.
Eye (Lond). 1993;7 ( Pt 1):74-9. doi: 10.1038/eye.1993.16.
Blood flow in the orbital vasculature can be investigated by colour Doppler velocimetry which allows simultaneous imaging of B-scan and Doppler ultrasound. In this paper we review the results of our recent studies on the arterial vasculature of the orbit and optic nerve head. A control study is described in which reliable measurements were obtained from the ophthalmic artery at the orbital apex, the medial orbit, and the complex of the central retinal artery and posterior ciliary arteries. Patients with occlusion of the central retinal artery and posterior ciliary arteries were examined. The results indicate that readings at the optic nerve head primarily represent blood flow in the central retinal artery. A study of the effects of posture on velocimetry demonstrated no change in the measurements obtained. Finally, topical timolol 0.5% was found to reduce the resistive indices of flow in the central retinal artery.
眼眶血管系统中的血流可以通过彩色多普勒测速法进行研究，该方法能够同时对B超和多普勒超声进行成像。在本文中，我们回顾了我们最近关于眼眶和视神经乳头动脉血管系统的研究结果。描述了一项对照研究，其中从眶尖的眼动脉、眼眶内侧以及视网膜中央动脉和睫状后动脉复合体获得了可靠的测量值。对视网膜中央动脉和睫状后动脉阻塞的患者进行了检查。结果表明，视神经乳头处的读数主要代表视网膜中央动脉的血流。一项关于体位对测速影响的研究表明，所获得的测量值没有变化。最后，发现0.5%的噻吗洛尔局部用药可降低视网膜中央动脉血流的阻力指数。
