Progression of Visual Field Damage within Clusters Depends on Preexisting Damage.

Purpose: To investigate, in a routine clinical setting, how global progression or progression within visual field clusters depends on preexisting damage.

Methods: Glaucoma patients with a visual field damage of at least 3 dB at baseline and a series of at least 5 good quality examinations were scrutinized retrospectively. The change in visual field damage within 10 visual field clusters was assessed in a mixed linear effects model with age, baseline global mean deviation (MD), baseline cluster MD, and observation time as covariates.