Ninety-five successive argon laser trabeculoplasties to as many patients were followed 6 to 18 (mean 8) months. Forty-eight eyes had capsular glaucoma and 35 simple glaucoma. The power used ranged from 100 mW to 1000 mW and the total energy from 1.0 J to 5.0 J. The success rates between groups were tested with a chi 2-test. With laser power of more than 500 mW and energy level more than 3.0 J, the success rates were maximal (77% and 75%).