Errors in Abstract and Text. In the Clinical Trials article titled “Canadian Glaucoma Study: 2. Risk Factors for the Progression of Open-angle Glaucoma,” by Chauhan et al, published in the August issue of the Archives (2008;126[8]:1030-1036), the Trial Registration identifier, which was listed in 2 places, was incorrect. On page 1030, the Trial Registration portion of the “Abstract” should have appeared as follows: “clinicaltrials.gov Identifier: NCT00262626.” On page 1031, the third sentence of the “Methods” section should have appeared as follows: “The CGS is a multicenter Canadian study involving 5 hospital-based university departments and is registered with the ClinicalTrials.gov Protocol Registration System (identifier NCT00262626).” Online versions of this article on the Archives of Ophthalmology Web site were corrected on August 11, 2008.