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Analysis of retinal microvasculature features in amblyopic eyes: A meta-analysis.

PURPOSE
This meta-analysis aimed to evaluate retinal vessel density (VD) in amblyopic patients using optical coherence tomography angiography (OCTA).


METHODS
PubMed, Web of Science, Embase, and Cochrane Library databases were systematically searched for published articles comparing retinal microvasculature characteristics in patients with amblyopia and controls. Continuous variable outcomes were assessed using the mean difference (MD) with a 95% confidence interval. Review Manager Version 5.30 was used for the analysis.


RESULTS
Thirteen qualified articles were pooled in this meta-analysis. Compared with controls, the foveal whole enface VD of superficial (SCP) and deep capillary plexus (DCP) of patients as measured by 3×3-mm scans were significantly lower in amblyopia eyes (MD: -1.37, P = 0.0003; MD: 1.70, P < 0.00001, respectively). Similarly, in the 6×6-mm scans, foveal whole enface VD of the SCP and DCP were remarkably lower in amblyopia eyes than in controls (MD: -2.24, P = 0.03; MD: -5.08, P = 0.04, respectively). The parafoveal VD of SCP in 3×3-mm scans (MD: -1.96, P < 0.00001) was also lower in amblyopic patients than in controls. Similarly, in 6×6-mm scans, amblyopia eyes showed a significant decrease, and a trending decrease in the parafoveal VD of the SCP (MD: -3.85, P = 0.007) and DCP (MD: -3.03, P = 0.10), respectively. For whole radial peripapillary capillary (RPC), VD was significantly reduced in amblyopic patients compared to controls (MD = -0.83, P < 0.00001). In addition, the deep foveal avascular zone (FAZ) was larger in amblyopic eyes than in the controls (MD = 0.55, P= 0.007).


CONCLUSIONS
Our data suggest that whole foveal and parafoveal VD and RPC whole VD were reduced in patients with amblyopia. Moreover, our results reveal that the FAZ is larger in amblyopic patients. Consequently, OCTA may have the potential for diagnosing and monitoring patients with amblyopia.