Submitted for Publication: September 16, 2010; final revision received March 5, 2011; accepted March 13, 2011.
Author Contributions: Dr Ebneter had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Financial Disclosure: None reported.
Funding/Support: This study was supported by grant 626964 from the National Health and Medical Research Council; by the Ophthalmic Research Institute of Australia; and by Foundation OPOS (Stiftung zugunsten von Wahrnehmungsbehinderten) (Dr Ebneter).
Role of the Sponsor: The supporting institutions had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Previous Presentation: This paper was presented at the 42nd Annual General Meeting and Scientific Congress Royal Australian and New Zealand College of Ophthalmologists; November 23, 2010; Adelaide, Australia.
Additional Contributions: Mark Daymon provided expert technical assistance.