Objectives  Efficacy of resident performed ALT has been studied before. No studies have explored the efficacy of resident performed SLT or compared the outcome of SLT with ALT when done by resident ophthalmologist. Furthermore, the effect of resident’s experience on laser outcome has not been studied. This study is to examine the outcome of ALT and SLT performed by ophthalmology residents. 
Methods Chart review of 226 consecutive patients with open angleglaucoma treated with ALT or SLT over 5 years at a single institution.  Success was defined by reduction inintraocular pressure (IOP)by 20% or morefrom baseline.
Results Mean baseline IOP for ALT and SLT groups were 17.1 mmHg and 17.9 mmHg, respectively.  The success rates were 37% for both groups (P= 0.9). More experiencedand less experiencedresidents have 40%and 30%of success rate, respectively (P=0.3). BaselineIOP was the only predictor for successidentifiedinamultivariable regression model.
Conclusion This study demonstrated that (1) resident performed ALT and SLT have equal IOP-lowering effect with 37% of success rate for both laser types; (2) success rate seems not to be affected by residents’ laser experience; and (3) baseline IOP predicts the outcome of resident performed laser trabeculoplasty.