Question 17

The Ocular Hypertension Treatment Study (OHTS) was a landmark randomized clinical trial to determine whether intraocular pressure (IOP) lowering medication in ocular hypertension patients would delay or reduce the risk of progression to primary open angle glaucoma (POAG). The study enrolled 1,686 patients from 1994 to 1996. Half of the patients received topical ocular pressure lowering medication and half were observed. Inclusion criteria included: the IOP in the higher pressure eye between 24-32 mm Hg and the IOP in the fellow eye of 21-32 mm Hg. The goal for IOP lowering in the treatment arm of the OHTS study was a reduction of the IOP of what percent?