·Lasers have been used to treat glaucoma for nearly 35 years.Recently,selective laser trabeculoplasty(SLT)as primary therapy for open angle glaucoma(OAG)is more safe and effective.SLT is a new method to reduce intraocular pressure in eyes with OAG.This method of treatment uses a frequency doubled,Q-switched YAG laser rather than an argon wavelength.This form of laser produces a very brief burst of laser energy that targets the melanin content of meshwork cells and selectively ablates them.This is in contrast to the thermal photocoagulation effect of argon treatment,which caused local and collateral damage.·