Materials and methods: 25 eyes of 25 patients diagnosed with primary open angle glaucoma who had undergone trabeculectomy surgery were included in the prospective study. Before surgery, ocular pulse amplitude (OPA) and intraocular pressure were measured by Pascal dynamic contour tonometer (DCT), intraocular pressure was also measured by Goldmann applanation tonometer (GAT), central corneal thickness was measured by digital ultrasonic pachymeter and short posterior ciliary artery (SPCA) blood fl ow was measured by colored doppler imaging ultrasonography, respectively in all eyes. All measurements were repeated at fi rst month after the surgery.

Results: Preoperative IOP and OPA values measured by DCT were 26.55±4.28 mmHg and 4.06±0.90, respectively. Nasal and temporal SPCA resistive index (RI) were 0.61±0.07 and 0.62±0.10, respectively. Postoperative 1st month IOP and OPA values measured by DCT were 14.36±2.49 mmHg and 2.52±0.56, respectively. Postoperative nasal and temporal SPCA RI were 0.49±0.09 and 0.52±0.09, respectively. There was a statistically signifi cant decrease in IOP, OPA, nasal and temporal SPCA RI postoperatively.

Conclusion: IOP, OPA and RI were decreased, nasal and temporal SPCA maximum, minimum and mean blood fl ow velocities were increased postoperatively compared to the preoperative values. There was a strong positive correlation between OPA and nasal SPCA RI. OPA score which gives information about ocular blood fl ow and resistive index may be a good predictive indicator for glaucoma follow up. Keywords : Glokom, oküler puls amplitüdü, resistif indeks,trabekülektomi,dopler ultrason