目的：采用Meta分析方法评价光学相干断层扫描血管成像(OCTA)在无视网膜病变的糖尿病(NDR)患者中的应用。

方法：计算机检索CNKI、WanFang Data、VIP、CBM、PubMed、Embase数据库以查找相关研究，检索时间为建库至2021-10。两名研究者独立筛选文献、提取资料，并采用NOS量表评价纳入研究质量，使用RevMan 5.3软件和STATA软件进行Meta分析和发表偏倚评价，对异质性较大的结果进行敏感性分析，确保结果的准确性。

结果：共纳入44项研究，包括NDR患者2 053例2 600眼，健康对照组患者1 775例2 117眼，对黄斑中心凹无血管区(FAZ)面积、周长，FAZ旁300μm内的血流密度(FD300)、非圆指数(AI)、黄斑区血流密度(VD)、神经节细胞复合体(GCC)厚度和视网膜神经纤维层(RNFL)厚度等17个指标进行了Meta分析，Meta分析结果显示：NDR组的FAZ浅层毛细血管丛(SCP)、深层毛细血管丛(DCP)面积、周长均高于健康对照组，FD300、黄斑区VD，RNFL厚度均低于健康对照组(均P<0.05)； NDR组的AI值略高于健康对照组，GCC厚度、视乳头周围VD低于健康对照组，但组间均无差异(P>0.05)。

结论：相比对健康对照组，NDR患者FAZ面积、周长增大，黄斑区VD、RNFL厚度降低，存在早期视网膜微血管损伤和神经退行性病变，OCTA可以作为DR早期诊断的辅助工具。

METHODS: CNKI, WanFang Data, VIP, CBM, PubMed, and Embase databases were searched for relevant studies. The retrieval time was from the establishment of the database to October 2021. Two investigators independently screened the literature, extracted data and evaluated the quality of the included studies using the NOS scale. Meta-analysis and publication bias evaluation was performed using RevMan 5.3 and STATA, and sensitivity analysis was performed for results with large heterogeneity to ensure the accuracy of the results.

RESULTS: A total of 44 studies, including 2 053 patients(2 600 eyes)with NDR and 1 775 healthy control patients(2 117 eyes), were included. The Meta-analysis was performed on 17 indexes including the area and perimeters of the foveal avascular zone(FAZ), the vascular density(VD)of FAZ-300um(FD300), acircularity index(AI), VD of macular area, ganglion cell complex(GCC)thickness and retinal nerve fiber layer(RNFL)thickness. Meta-analysis results showed that the area and perimeter of FAZ in superficial capillary plexus(SCP)and deep capillary plexus(DCP)in the NDR group were higher than those of healthy control patients, and FD300, VD of macular area and RNFL thickness were all lower than those in the control group(all P<0.05); The AI values in the NDR group were slightly higher than those in the normal control group, and the GCC thickness and VD of peri-optic papillary were lower than those in the control group, but there was no differences between the groups(P>0.05).

CONCLUSIONS: Compared to the healthy control group, NDR patients had increased FAZ area and perimetry, decreased VD of macular area and RNFL thickness and early retinal microvascular damage and neurodegenerative lesions. OCTA could be used as an auxiliary tool for early diagnosis of DR.