ObjectiveTo systematically review the efficacy and safety of deproteinized calf blood extractives (DCBE) for dry eye syndrome. MethodsPubMed, EMbase, The Cochrane Library, CNKI, WanFang Data, CBM and VIP databases were electronically searched to collect studies on efficacy and safety of DCBE for dry eye syndrome from inception to August 31st, 2021. Two reviewers independently screened literature, extracted data and assessed the risk of bias of included studies; then, meta-analysis was performed by using RevMan 5.3 software. ResultsA total of 59 studies were included. The results of meta-analysis showed that: the total effective rate of DCBE for dry eye syndrome was better than that of control (RR=1.20, 95%CI 1.12 to 1.29, P<0.000 01), sodium hyaluronate eye drops (RR=1.21, 95%CI 1.15 to 1.28, P<0.000 01), and hydroxyl sugar eye drops (RR=1.15, 95%CI 1.04 to 1.27, P=0.006). The incidence of adverse events had no statistical differences between the DCBE and the control or the sodium hyaluronate eye drops.ConclusionCurrent evidence shows that DCBE for dry eye syndrome can improve the total effective rate, and the safety is acceptable. Due to the limited quality and quantity of the included studies, more high-quality studies are needed to verify the above conclusion.
