Progression of visual field defects and visual loss in trabeculectomized eyes

To evaluate progression of visual field (VF) defects and development of visual impairment (low vision and blindness) after trabeculectomy. We evaluated retrospectively 138 eyes of 138 consecutive patients over 40 years of age with primary open-angle glaucoma (POAG) or exfoliation glaucoma (EG) operated on by trabeculectomy without antimetabolites. The mean follow-up period was 3.5 years (range 2-5). In 83 eyes, pre- and postoperative VF measured by the same technique were compared to detect progression. Visual acuities (VA) were recorded as Snellen decimal notations. VA of