Study to the Ocular Hypertension Treatment Study

(OHTS) and to examine the associations between optic disk topography, and baseline demographic, clinical, and ocular factors at study entry. ● DESIGN: A randomized clinical trial. ● METHODS: Participants in this ancillary study were recruited from seven of the 22 OHTS clinical centers. Each participant completed imaging annually using a CSLO, the Heidelberg Retina Tomograph (HRT). As-sociations between HRT topographic optic disk measure-ments and intraocular pressure (IOP), baseline photographic estimates of horizontal and vertical cup-to-disk diameter ratios by the OHTS Optic Disk Reading Center, baseline visual field indices, and demographic and clinical factors were assessed using linear mixed effects models