Argon laser trabeculoplasty was applied in 43 patients, 46 eyes. 34 eyes had had primary open-angle glaucoma, while 12 eyes had secondary open-angle glaucoma where no compensation of intraocular pressure was achieved although maximal medical therapy was conducted. Applying argon laser trabeculoplasty the intraocular pressure was normalized in 86% of eyes with a primary glaucoma considering period of 18.31 +/- 2.80 months. In 58.4% of eyes with secondary glaucoma satisfactory reduction of intraocular pressure was achieved considering period of 14.57 +/- 7.91 month.