glaucoma is the 2nd leading cause for blindness in the western world.at the time approximately 60 million people are diagnosed as glaucoma patients with an estimated rise of 30% in the next decade. glaucoma is defined as a progressive damage to the optic nerve ,followed by a damage to the visual field. high intraocular pressure (IOP) is considered a main risk factor.lowering IOP can be done in several ways ,including medication ,laser treatment and operations.~medical treatment is effective in most cases ,but requires high daily compliance,side effects and availability of medication in living areas.~laser trabeculoplasty treatment for reducing IOP is a first line treatment for patients with open angle glaucoma (OAG).with success rate of 70-90%, it can be done as an additive treatment or as a sole treatment.~SLT or cold laser is a non-invasive treatment in which short wave lengths are being transduced in short intervals ,through a gonioscopic lens to the area of filtering angle. thec wave length is specific to cells rich in melanin (located in the filtering angle). the mechanism of action is regeneration of cytokine surge -causing macrophages recruitment and breakage of inter-cell connections at the trabecular meshwork (filtering area) and allows rise in fluid shift. the treatment requires several lasering to areas at the surrounding the wave does not cause rise in tissue heat or scaring of tissue and can be repeated.among its disadvantages are reduction in affect during time,causing new elevation of IOP , potential peripheral anterior synechia (PAS), corneal erosion or oedema,requires experience in treating through gonioscopic lense.~previous reports in the literature regarding external low intensity laser (LIL)show less complication rate.~our study evaluates the use of external SLT by using a standard retinal laser machine ,with procedure performed on the outer sclera-above the trabecular meshwork with laser parameters similar to those used in retinal surgeries.~this is a prospective, randomized, comparative clinical trial.
The purpose of this study is to evaluate the advantages and disadvantages of external selective laser trabeculoplasty (SLT) in treating open angle glaucoma,compared to traditional SLT.