For the first 6 months, all patients will receive daclizumab injections and evaluations every 2 weeks. After that, if other medications have been reduced and vision has remained stable, treatments and evaluations may be spread out to every 3 or 4 weeks. Over time, fewer tests may be required during the biweekly examinations if the patient is doing well, but nearly all the examinations done at screening will be repeated at 3-month intervals. If inflammation or vision loss occurs during drug tapering, appropriate treatment will be administered. If the vision loss is too great, the patient will be treated with steroids or other medicines and taken off the study.