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  1. Juan E Grunwald
  1. Correspondence to Juan E Grunwald, Department of Ophthalmology, University of Pennsylvania Medical School, 51 N. 39th Street, Philadelphia, PA 19096, USA; juangrun{at}mail.med.upenn.edu

https://doi.org/10.1136/bjo.2011.205146

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    We disagree with the assertion of Dr McGwin1 that our study design and analysis are incorrect. We describe our study as cross-sectional because the measurements were performed in a single visit of each …

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    Footnotes

    • Linked article 204313.

    • Competing interests None.

    • Ethics approval This study was conducted with the approval of the University of Pennsylvania IRB.

    • Provenance and peer review Commissioned; not externally peer reviewed.

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