[Increase in visual field defects under long-term timolol treatment in patients with open-angle glaucoma - observations from an ophthalmology practice].

The authors report on 6 patients with open-angle glaucoma who were treated with Timolol eye drops for 2 years. During this period the intraocular pressure was normal at all times. In spite of this a deterioration in visual fields occurred, in some of the cases associated with reduced vision. It is emphasized that these patients form part of a larger group comprising 30 individuals. In the remaining 24 patients no deterioration of the visual field or vision was found during the 2 years of treatment with Timolol.