[Status of blood supply to the eye in patients with primary open-angle glaucoma depending on the value of systemic arterial pressure and level of ophthalmic tone].

Blood supply to the eye was studied in 756 patients aged 40-82 years (1339 eyes) with primary open-angle glaucoma, systemic arterial pressure (AP) 105-170 mm Hg, and various level of intraocular pressure (IOP). Control group consisted of 340 healthy subjects (680 eyes) aged 28-80 years without ophthalmic diseases with the same AP values. Blood supply values in the controls were taken for the norm. They were in high correlation with systemic AP. Ocular blood supply in patients with primary open-angle glaucoma depends on systemic AP and IOP, particularly perfusion pressure (Pperf) which decreases by 3.1 mm Hg in patients with systemic AP of 126-139 mm Hg and moderately (from normal to moderate) increased IOP. If IOP increases in the interval from moderate to high in patients with the same AP, Pperf drops by 12.5 mm Hg. Pperf values indicate deterioration of ocular blood supply in patients with primary open-angle glaucoma and different levels of IOP.