Trabeculectomy and the progression of glaucomatous visual field loss
E. B. Werner, S. M. Drance and M. Schulzer
Twenty-four eyes of 20 patients with chronic open angle glaucoma who had a
trabeculectomy were studied retrospectively. Trabeculectomy resulted in a
significant lowering of mean intraocular pressures and improvement of
pressure control for the group. Progression of visual field defects
occurred in all 24 eyes preoperatively, while postoperatively, the fields
of 14 eyes showed no change, but the other ten showed further progression.
A comparison of the pressures of the eyes showing continued progression
after surgery with the eyes showing no further progression revealed no
significant difference in the mean preoperative or postoperative pressure
or the mean pressure reduction after surgery. Measurements of the quality
of the control, however, showed that the quality of pressure control was
significantly better in the eyes that did not show progression of field
loss postoperatively. Careful postoperative follow-up observation of the
visual field remains necessary even after successful surgical pressure
reduction.
