<prompt> Argon laser trabeculoplasty is done in:Angle closure glaucomaAngle recession glaucomaSecondary glaucomaOpen angle glaucoma  <response>: In Argon Laser Trabeculoplasty ALT Laser beam is focused on trabecular meshwork Opens up the pores of trabecular meshwork. So that more Aqueous can flow through it in faster time Lowers Intra ocular pressure Typically done in open angle glaucoma Trabecular meshwork After ALT 