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. An altered perfusion of the optic nerve head has been proposed  as a pathogenic factor in glaucoma. Objective. The aim of this study was to  evaluate the correlation between ocular pulse amplitude (OPA), measured by  Dynamic contour tonometer (DCT) and colour Doppler imaging (CDI) of the  arteric retro- bulbar vessels. Methods. Twenty patients older than 50 years  were examined, and divided into two equal groups. The first group comprised  of patients with normal tension glaucoma treated with topical  antiglaucomatous therapy, and the second group included patients with ocular  hypertension and glaucoma suspicious without any antiglaucomatous therapy.  Ocular pulse amplitude (OPA) was measured with DCT. CDI was also performed.  We measured haemodynamic parameters of the internal carotid artery (ICA),  ophthalmic artery (OA), central retinal artery (CRA), and posterior  ciliary arteries (PCA). Peak systolic (PSV), end- diastolic (EDV) velocities  were measured, and resistance index (RI) and pulsatility index (PI) were  calculated. Results Correlation with OPA showed indirect servitude in the RI  of the ICA, RI and PI of the CRA, in the first group; and in the PSV and EDV  of the ICA, in the RI and PI of the OA, EDV and RI of the CRA, and RI of the  PCA, in the second group Conclusion. Increase of OPA was mostly followed by  the increase of the parameters (PSV, EDV, RI, and PI) of the arteric  retrobulbar vessels in the first group; in the second group, increase of OPA  was in almost 50% of parameters followed by their decrease

Correlation between ocular pulse amplitude measured by dynamic contour tonometer and colour doppler flow imaging of the arteric retrobulbar vessels