Agreement Among Glaucoma Specialists in Assessing Progressive Disc Changes From Photographs in Open-Angle Glaucoma Patients

Interobserver agreement among glaucoma specialists in judging progressive optic disc change from stereophotographs was slight to fair. After masked adjudication, in 40% of the cases in which the optic disc appeared to have progressed in glaucoma severity, the photograph of the “worse” optic disc was in fact taken at the start of the study. Caution must be exercised when using disc change on photographs as the “gold standard” for diagnosing open-angle glaucoma or determining its progression.