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Diagnostic performance of laser speckle flowgraphy in glaucoma: a systematic review and meta-analysis

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Abstract

Purpose

To evaluate the diagnostic value of laser speckle flowgraphy (LSFG) in glaucoma by investigating the mean blur rate (MBR) in the optic nerve head.

Methods

Systematic literature search was performed in the CENTRAL, Web of Science, PubMed, and EMBASE databases to obtain relevant studies published until December 2020 without restrictions. The Newcastle–Ottawa Scale (NOS) was used for study quality assessment. The outcome measures included the MBRs of the entire (MA), vascular (MV), and tissue (MT) areas. Subgroup analyses were performed according to glaucoma type. All data were analyzed using RevMan and Comprehensive Meta-Analysis 3.3 software.

Results

Fifteen studies, including 692 glaucomatous and 386 healthy eyes, were included. Of these, 11 studies reported the MA, MV, and MT, three studies only reported MT, and one study only reported MV. All were classified as case–control studies and had good NOS scores. The meta-analysis showed that the MA and MT were significantly reduced in glaucomatous eyes (mean difference [MD] − 5.59, 95% confidence interval [CI] − 6.19 to − 4.99, p = 0.1; MD − 2.2, 95% CI − 2.49 to − 1.91, p = 0.07, respectively) with moderate heterogeneity (p = 0.1, I2 = 38%; p = 0.07, I2 = 39%, respectively). There was also a significant difference in the MV between glaucomatous and healthy eyes (MD − 5.92, 95% CI − 7.77 to − 4.07) with significant heterogeneity (p = 0.0003, I2 = 69%). The subgroup analyses revealed significant differences in the MBR among different glaucoma types.

Conclusions

Glaucoma is closely related to ocular blood flow changes. This meta-analysis suggests that LSFG is a feasible diagnostic tool for glaucoma. However, further longitudinal prospective studies are needed.

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Funding

This work was supported by the National Natural Science Foundation of China (grant number 81570841).

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Authors and Affiliations

  1. Department of Ophthalmology, Affiliated Hospital of Southwest Medical University, Luzhou, 646000, Sichuan, China

    Chao Gu & Ling Yu

  2. Department of the School of Public Health of Southwest Medical University, Luzhou, 646000, Sichuan, China

    Ailing Li

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  1. Chao Gu
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  2. Ailing Li
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Contributions

All authors have made substantive intellectual contributions to this study. CG and LY contributed to study conceptualization and design. CG and LA performed the literature search and data collection. CG analyzed the data and drafted the manuscript. All authors contributed to statistical analysis. All authors have reviewed and approved the final version of the manuscript.

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Correspondence to Ling Yu.

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The authors of this manuscript have no relevant financial or nonfinancial interests to disclose.

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Gu, C., Li, A. & Yu, L. Diagnostic performance of laser speckle flowgraphy in glaucoma: a systematic review and meta-analysis. Int Ophthalmol 41, 3877–3888 (2021). https://doi.org/10.1007/s10792-021-01954-3

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  • DOI: https://doi.org/10.1007/s10792-021-01954-3

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