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. An altered perfusion of the optic nerve head has been proposed  as a pathogenic factor in glaucoma. Objective. To evaluate changes of  haemodynamic parameters in the retrobulbar arterial circulation after a  decrease of elevated intraocular pressure (IOP) in patients with primary open  angle glaucoma (POAG). Methods. Twenty-six patients were examined, 14 men and  12 women, 21 up to 50 years old and 5 below, all with previously diagnosed  and treated POAG, and all examined at the Eye Clinic, Clinical Centre of  Serbia. IOP was measured both with a Goldmann aplanation tonometer and  dynamic contour tonometer. Central corneal thickness was measured with  ultrasound pachymeter. Imaging of the retrobulbar arterial circulation by  colour Doppler was performed at the Neurology Clinic, Clinical Centre of  Serbia. It involved measuring of haemodynamic parameters of the ophthalmic  artery, central retinal artery, and posterior ciliary arteries. Peak systolic  velocity (PSV) and end-diastolic velocity (EDV) were measured, and resistive  index (RI) and pulsatility index (PI) were calculated. Results. Haemodynamic  arterial parameters PSV and EDV in the ophthalmic and central retinal artery  after decrease of IOP were lower, while RI and PI were higher. In the  posterior ciliary arteries PSV, EDV and PI were lower, and RI was higher.  Conclusion. Changes of the retrobulbar arterial circulation after elevated  IOP in POAG patients are important for approach and treatment, while the role  of vascular factors in the supplement of the optic disc neuroretinal rim  could be a key for progression backlash of glaucoma and the radix of  neuroprotection

Changes in the retrobulbar arterial circulation after decrease of elevated intraocular pressure in patients with primary open angle glaucoma