You are here

Article Text

Article menu
Download PDFPDF
PostScript
Were the groups in the trabeculectomy versus Ahmed valve study really comparable?
  1. O A R Mahroo,
  2. R Stanbury,
  3. K S Lim
  1. Department of Ophthalmology, St Thomas' Hospital, London, UK
  1. Correspondence to Dr Omar Mahroo, Department of Ophthalmology, St Thomas' Hospital, Westminster Bridge Road, London SE1 7EH, UK; oarm2{at}cam.ac.uk

https://doi.org/10.1136/bjo.2009.177998

Statistics from Altmetric.com

    Request Permissions

    If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.

    We read with interest the comparison by Tran et al of success rates of Ahmed valve implantation versus trabeculectomy in open-angle glaucoma.1 As the authors know, the retrospective nature of the study may result in selection bias. The validity of the comparison depends critically on the two groups of patients being similar preoperatively, and we feel this may not have been adequately shown.

    The mean baseline visual acuities (table 1) of the …

    View Full Text

    Footnotes

    • Competing interests None.

    • Provenance and peer review Not commissioned; not externally peer reviewed.