Selective Laser Trabeculoplasty (SLT) is a procedure used to reduce the pressure in the eye (also known as intra-ocular pressure). A laser beam is applied to the drainage channels, which helps to unclog them. This means the aqeous humour flows through the channels better, reducing the pressure in the eye. This is not a permanent treatment, and may need to be repeated in the future to control the eye pressures adequately. The procedure does not require admission to hospital and is carried out in the outpatients department.