Experimental Study of Aqueous Humor Flow in a Transparent Anterior Segment Phantom by Using PIV Technique

• 作者: Gong Zhang Hongfang Song Huangxuan Zhao Qi Li Tan Li Wenjia Wang Xiuqing Qian Yang Yu Zhicheng Liu
• 来源期刊: 分子与细胞生物力学(英文)
• 学科: 物理学
• 关键词: Aqueous HUMOR particle image VELOCIMETRY experimental FLOW visualization GLAUCOMA
• 年，卷（期）: 2019,（1）
• 页码范围: 59-74
• 页数: 16页
• 分类号: O35

摘要

Pupillary block is considered as an important cause of primary angle-closure glaucoma(PACG).In order to investigate the effect of pupillary block on the hydrodynamics of aqueous humor(AH)in anterior chamber(AC)and potential risks,a 3D printed eye model was developed to mimic the AH flow driven by fluid generation,the differential pressure between AC and posterior chambers(PC)and pupillary block.Particle image velocimetry technology was applied to visualize flow distribution.The results demonstrated obvious differences in AH flow with and without pupillary block.Under the normal condition(without pupillary block),the flow filed of AH was nearly symmetric in the AC.The highest flow velocity located at the central of AC when the differential pressure between AC and PC was under 5.83 Pa,while it appeared near the cornea and iris surface when the differential pressure was greater than 33.6 Pa.Once pupillary block occurred,two asymmetric vortices with different sizes were observed and the shear stress in the paracentral cornea and iris epithelium increased greatly.It can be concluded that the pupillary block and the elevated differential pressure between AC and PC could change the flow distribution and thus increase the risk of corneal endothelial cells detachment.This study could make a further understanding of the pathogenesis of PACG.