Short-term effect of intraocular pressure variation on differential light threshold and colour vision.

Laser trabeculoplasty was performed in one eye in each of 38 patients with uncontrolled chronic open-angle glaucoma (37 patients) or low-tension glaucoma (1). Topical therapy was stopped for 1 week before the procedure and for 1 week before reassessment 6 weeks later. Differential light threshold values were determined with an automatic perimeter four times throughout the study, and colour vision was tested twice. The patients were followed for 3 months. The rise and subsequent drop in intraocular pressure were not found to be correlated with differential light threshold or colour error scores.