Submitted for Publication: March 6, 2014; final revision received August 24, 2014; accepted September 5, 2014.
Published Online: October 23, 2014. doi:10.1001/jamaophthalmol.2014.4237.
Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: All authors.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: All authors.
Administrative, technical, or material support: Russell, Crabb.
Study supervision: Russell, Crabb.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Additional Contributions: The authors thank Andrew McNaught, MD, MB, BS, Department of Ophthalmology, Gloucestershire Hospitals NHS Foundation Trust, Cheltenham Cranfield University, Bedford, England; James Kirwan, MA, Department of Ophthalmology, Queen Alexandra Hospital, Portsmouth, England; and Nitin Anand, MBBS, MD, Calderdale and Huddersfield NHS Foundation Trust, for providing access to visual field data from their respective hospitals. These individuals did not receive financial compensation for their contributions.
Correction: This article was corrected on October 27, 2014, for typographical errors in the Additional Contributions and References.