A comparative study of sutureless scleral tunnel trabeculectomy versus conventional trabeculectomy in the management of primary open-angle glaucoma.

The aim of this study was to compare the outcome and complications of sutureless trabeculectomy with conventional trabeculectomy. A total of 52 eyes were randomly assigned to two groups. One group received standard conventional trabeculectomy and the other group received sutureless trabeculectomy. The patients were evaluated at 1, 3, 6 and 12 months after surgery. Patient data such as sex, age, intraocular pressure (IOP), logMAR visual acuity, antiglaucoma medications, and intraoperative and postoperative complications were collected and statistically analyzed. The mean age of the conventional and sutureless groups was 48.5 ± 15.4 and 57.3 ± 13.9 years, respectively. All patients achieved IOP levels <21 mmHg with a mean IOP of 13.4 ± 5.3 mmHg in the conventional group and 12.8 ± 2.6 mmHg in the sutureless group at 6 months and 11.00 ± 1.3 and 12.4 ± 3.2 mmHg at 12 months post surgery, respectively. These results showed a significant decrease compared to preoperative measures but did not show a significant difference between the two groups (p = 0.659). The number of antigalucoma medications used postoperatively showed a significant decline from preoperative status of 0.7 ± 0.58 in the conventional group and 0.4 ± 0.4 in the sutureless trabeculectomy group after 6 months and 0.68 ± 0.8 and 0.78 ± 0.9 after 12 months, respectively; however, there was no significant difference between the two groups (p = 0.112). No intraoperative complications were encountered in any of the groups. One patient in the sutureless trabeculectomy group developed mild hyphema which was managed medically. In the conventional group, two patients had failed trabeculectomy which was successfully revised, two patients showed hypotony 2 days after surgery which was managed medically and normal pressure was achieved within 5 days. Sutureless trabeculectomy appears to be a safe and easy method with results comparable to conventional trabeculectomy.

Signal and noise transfer in spatiotemporal quantum-based imaging systems.

Fourier-based transfer theory is extended into the temporal domain to describe both spatial and temporal noise processes in quantum-based medical imaging systems. Lag is represented as a temporal scatter in which the release of image quanta is delayed according to a probability density function. Expressions describing transfer of the spatiotemporal Wiener noise power spectrum through quantum gain and scatter processes are derived. Lag introduces noise correlations in the temporal domain in proportion to the correlated noise component only. The effect of lag is therefore dependent on both spatial and temporal physical processes. A simple model of a fluoroscopic system shows that image noise is reduced by a factor that is similar to Wagner's information bandwidth integral, which depends on the temporal modulation transfer function.