Saeed Shokoohi-Rad, - Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Ghalom-Hosein Yaghubi - Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Abbas Hoseini-Rad - Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

Purpose: Make a Comparison between the ocular perfusion pressure in patient with open angle glaucoma and the control group Methods: The present study was a case-control study in the case group of patients with glaucoma diagnosed by an ophthalmologist. After selecting the case group and confirming the open angle glaucoma in patients with gonioscopy, intraocular pressure control was measured by non-contact tonometry and blood pressure by means of the keeler pressure gauge in both groups and the peripheral pressure was calculated.Ocular perfusion pressure calculated by this formula: OPP= ²⁄