Pattern scanning laser trabeculoplasty versus selective laser trabeculoplasty in patients with primary open angle glaucoma

Abstract

Purpose: The aim of this study is to compare the reduction percent of intraocular pressure (IOP) after selective laser trabeculoplasty (SLT) or pattern laser scanning trabeculoplasty (PSLT) in a group of patients with hypertensive glaucoma. Materials and Methods: A quasi-experimental prospective study of the patients with baseline IOP of 20 mmHg or more (with at least 1 IOP lowering medication) underwent either PSLT or SLT at 360°. IOP was measured in the following time points: Hour 1, Day 1 and 7, months 1, 3, 6, and 12 after the laser procedure. Results: The mean age was 68.1 ± 10.1 in the PSLT group and 71.8 ± 4.0 in the SLT group. Eleven eyes (8 patients) underwent PSLT and 9 eyes (6 patients) underwent SLT. Baseline IOP was 22.45 ± 2.4 mmHg, PSLT; 25.0 ± 2.2 mmHg, SLT; (P > 0.05) on an average of 2.4 medications. In the PSLT group, the mean IOP at 1 h, 1, 3, 6 and 12 months was 19.0 ± 5.0, 14.7 ± 2.4, 15.3 ± 3.0, 14.5 ± 2.7, and 13.0 ± 3.1, respectively. In the SLT group, the mean IOP at 1 h, 1, 3, 6 and 12 months was 25.6 ± 6.4, 15.9 ± 4.4, 15.3 ± 2.6, 16.7 ± 4.8, and 21.2 ± 4.3, respectively. IOP was significantly lower in the PSLT group compared to the SLT group at 1 h (P < 0.01) and 12 months (P < 0.01). No serious adverse events were recorded. Conclusions: PSLT was similar in effect compared to SLT at 1, 3, 6 months, and more effective than SLT at 12 months.

Keywords

• ocular hypertension
• open-angle glaucoma
• pattern laser scanning trabeculoplasty
• selective laser trabeculoplasty