Selective laser trabeculoplasty, or SLT, is a safe and effective treatment for reducing the eye pressure. High pressure in the eye can cause glaucoma by damaging the optic nerve at the back of the eye. Eye pressure remains within a normal range because there is a balance between the fluid produced and drained from the eye. Fluid drains out of the eye though the Trabecular Meshwork. Over production or insufficient drainage, causes an imbalance in the eye's ability to regulate pressure, resulting in an increase in eye pressure. Most patients with open angle glaucoma must use eye drops daily to lower eye pressure, but they can cause side effects such as discomfort and pain. SLT is a quick and painless outpatient procedure. Using a special lens to aim the laser, your doctor will apply the laser into the drainage area. The laser does cause any damage, but reduces the resistance of the trabecular meshwork, by changing its shape at a microscopic level. Aqueous fluid drainage improves and eye pressure is usually reduced in approximately 3 out of 4 patients. The effect, usually last for years, but it can be repeated if required.