OCTA and Glaucoma Progression in the Non-Human Primate

描述 青光眼是一组导致视网膜神经节细胞（RGC）的病理性损失和不可逆的视网膜损害的疾病。 视力丧失眼内压（IOP）升高是青光眼的主要危险因素，但一些患有青光眼的个体 高压力不会导致疾病，而低压力的人则会失明。同样，在 在非人灵长类动物实验性青光眼模型中，显示具有相似IOP曲线的动物具有 视网膜神经纤维层（RNFL）厚度丢失的程度和速率有显著差异。临床和 实验模型表明，除了眼压外，青光眼还需要考虑其他因素 进展我们假设疾病进展的变异性可以通过血管因素来解释。的 视网膜是人体内代谢最多的组织之一，目前尚不清楚血管相对较低的眼睛是否会发生视网膜病变。 体积，或显示灌注随IOP变化而变化较大的眼睛具有更大的病理风险。 此外，虽然患有视神经病变的眼睛血管密度降低，但仍不清楚是否存在血管密度降低。 是在RGC丧失之前的视网膜血管系统的变化。光学相干断层扫描血管造影（OCTA） 是一种用于三维血管灌注成像的非侵入性方法。然而，对OCTA成像的分析 在脉管系统中，基于平板投影，其中失去了组织的三维性质。此外，OCTA 血管灌注通常被认为是静态测量，但血管流速具有时间特性。为 在这个项目中，我们优化了OCTA扫描，以量化血管体积和血管体积密度，并使用 序列和配准扫描，OCTA时间变异性。在非人类灵长类实验性青光眼中， 模型，我们将确定; 1。如果疾病进展率与基线全球和地区指标相关 血管体积/体积密度和局部OCTA时间变异性，2。如果有血管容量的损失 前视网膜内层厚度，3.如果结构和功能变化的速度与 其中血管灌注随IOP激发而改变，以及4.利用死后组织，定义血管解剖 （周细胞覆盖率、内皮细胞密度、毛细血管基底膜厚度/完整性） 疾病眼睛和与体内OCTA测量的相关性。成功完成这些目标将确定， 使用OCTA量化的血管测量可用于确定病理风险和青光眼发生率 进展

DESCRIPTION Glaucoma is a group of diseases that results in a pathological loss of retinal ganglion cells (RGC) and irreversible vision loss. Increased intraocular pressure (IOP) is a major risk factor for glaucoma, but some individuals with elevated pressures never develop disease, and others with low pressures progress to blindness. Similarly, in the non-human primate experimental glaucoma model, animals with similar IOP profiles are shown to have significant differences in the extent and rate of retinal nerve fiber layer (RNFL) thickness loss. Both clinical and experimental models suggest that in addition to IOP, other factors need to be considered for glaucoma progression. We hypothesize the variability in disease progression can be explained by vascular factors. The retina is one of the most metabolic tissues in the body, and it is unknown if eyes with relatively lower vascular volume, or eyes that show greater change in perfusion with changes in IOP are at greater risk of pathology. Furthermore, although eyes with optic neuropathy have reduced vascular density, it remains unknown if there are changes in retinal vasculature that precede RGC loss. Optical coherence tomography angiography (OCTA) is a non-invasive method for three-dimensional vascular perfusion imaging. However, analysis of OCTA imaged vasculature is based on slab projections, where the three-dimensional nature of tissue is lost. In addition, OCTA vascular perfusion is often considered a static measure, but vascular flow velocity has temporal properties. For this project, we have optimized OCTA scans to quantify vascular volume and vascular volume density, and using sequential and registered scans, OCTA temporal variability. In the non-human primate experimental glaucoma model, we will determine; 1. if the rate of disease progression is related to baseline global and regional measures of vascular volume / volume density and regional OCTA temporal variability, 2. if there is loss of vascular volume prior to inner retinal thickness, 3. if the rate of structural and functional changes are is related to the extent to which vascular perfusion changes with IOP challenge, and 4. using post-mortem tissue, define vascular anatomy (pericyte coverage, endothelial cell density, capillary basement membrane thickness/integrity) in healthy and disease eyes and association with in vivo OCTA measures. Successful completion of these aims will establish if vascular measures as quantified using OCTA can be used to determine risk of pathology, and rate of glaucoma progression.