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Re: Tham et al.: Global prevalence of glaucoma and projections of glaucoma burden through 2040: a systematic review and meta-analysis (Ophthalmology 2014;121:2081-90)

      We read with interest the article by Tham et al.
      • Tham Y.C.
      • Li X.
      • Wong T.Y.
      • et al.
      Global prevalence of glaucoma and projections of glaucoma burden through 2040: a systematic review and meta-analysis.
      The authors strive to provide an “accurate estimation of the current glaucoma prevalence and future projections of the number of people with glaucoma” based on existing literature. Regarding angle-closure glaucoma (ACG) in non-Asian populations, we would like to opine that this is very difficult to estimate at present, owing to the meager amount and quality of available data. This fact was not highlighted by the authors.
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      References

        • Tham Y.C.
        • Li X.
        • Wong T.Y.
        • et al.
        Global prevalence of glaucoma and projections of glaucoma burden through 2040: a systematic review and meta-analysis.
        Ophthalmology. 2014; 121: 2081-2090
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      Linked Article

      • Global Prevalence of Glaucoma and Projections of Glaucoma Burden through 2040: A Systematic Review and Meta-Analysis
        OphthalmologyVol. 121Issue 11
        • Preview
          Glaucoma is the leading cause of global irreversible blindness. Present estimates of global glaucoma prevalence are not up-to-date and focused mainly on European ancestry populations. We systematically examined the global prevalence of primary open-angle glaucoma (POAG) and primary angle-closure glaucoma (PACG), and projected the number of affected people in 2020 and 2040.
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      • Author reply
        OphthalmologyVol. 122Issue 7
        • Preview
          We thank the authors for their valuable comments and suggestions. We agree with the first comment that accurate determination of the prevalence estimates of primary angle-closure glaucoma (PACG) in non-Asian populations is challenging, particularly for North America, Latin America, and Europe. This is mainly owing to the limited PACG prevalence data available in these regions. We would like to clarify that we included a total of 15 publications with PACG data available from non-Asian populations in our systematic review as opposed to 7 publications suggested by the authors (see Fig 2B).
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