Article Text

Download PDFPDF
Authors' response
  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}

Statistics from

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 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 …

View Full Text


  • 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.

Linked Articles