Does selective laser trabeculoplasty treatment affect anterior chamber angle?

The Selective laser trabeculoplasty (SLT) is a treatment method for primary open angle glaucoma (POAG). It applies laser beams directly to anterior chamber angle (ACA) and leads some degree of alteration in the trabecular meshwork. This study was conducted to evaluate ACA alterations after the SLT treatment. A prospective crosssectional study performed on 53 eyes of 27 POAG patients. A single session of SLT was performed to previously untreated, non-operated, clear corneal eyes. Scheimpflug corneal topographic (SCT) measurements were performed before and at the 3rd month after SLT treatment. The central corneal thickness (CCT) measurements (pre-treatment 549.2±35.2 μm, posttreatment 545.6±36.9 μm) were found significantly reduced (P=0.007). SLT did not alter the quantitative measurement of the ACA (pre-treatment 39.6°±5.4, post treatment 40.0°±5.2; P=0.169). Anterior chamber depth remained unaffected from SLT (pre-treatment 3.29±0.2 mm, post treatment 3.29±0.2; P=0.827). In conclusion, a significant decrease in CCT was present without any alteration on ACA making SLT a favorable technique for POAG treatment.