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Updated: Mar 25, 2026
Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
Published on: March 26, 2020
Geometric Decomposition of OCT Angiography in RVO: Unmasking Congestive Versus Compensatory Phenotypes and Deep
Jinlian Zhan1, Dijie Qiao1, Gangan Sun1
1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China.
Purpose:
To characterize microvascular remodeling in retinal vein occlusion (RVO) by distinguishing "congestion" from "compensation" using morphologic decomposition and to evaluate translaminar retina-choroid coupling.
Methods:
Swept-source optical coherence tomography angiography was performed on 226 eyes (88 RVO-affected, 88 fellow, 50 healthy controls). Vessel density (VD) was geometrically decomposed into vessel length density (VLD; abundance) and vessel diameter index (VDI; caliber). Linear mixed-effects models were used to account for intereye correlation.
Results:
In the deep capillary plexus (DCP), fellow eyes exhibited "inefficient compensation" characterized by significantly increased VLD (25.17 ± 4.98 vs. 20.83 ± 4.02 mm/mm²) and decreased VDI (1.42 ± 0.07 vs. 1.47 ± 0.04) compared to controls (P < 0.001). Affected eyes demonstrated "congestive failure" with decreased VLD (16.06 ± 4.84 mm/mm²) and increased VDI (1.51 ± 0.09) (P < 0.05). DCP ischemia was strongly correlated with total retinal thickness (TRT, representing macular edema severity; ρ = -0.43, P < 0.001). A numerical "disease gradient" in retina-choroid coupling (DCP-choroidal vascularity index correlation) was identified: healthy (ρ = 0.37), fellow (ρ = 0.42), and affected eyes (ρ = 0.54). Sensitivity analysis revealed a biphasic synchronization sequence: temporary functional decoupling in mild edema (ρ = 0.30), followed by profound pathologic synchronization in severe congestive disease (TRT ≥400 µm, ρ = 0.63).
Conclusions:
RVO is a bilateral, hierarchical disorder. Morphologic decomposition reveals subclinical compensatory remodeling in fellow eyes that is obscured by conventional VD analysis. The progressive synchronization of deep retinal and choroidal degeneration suggests that RVO involves a pathologic collapse of neurovascular autoregulation.
Translational Relevance:
Decomposing density into length and diameter provides superior biomarkers for detecting early subclinical changes and monitoring the congestive status of RVO eyes.
