Laser defined as light amplification by stimulated emissions of radiation is now a routine modality of treatment in many branched of medicine but it has a great role in ophthalmology in the treatment of various ophthalmic disorders the types of laser used are Xenon arc Ruby Argon Yag  Yag is the commonest  use laser in ophthalmology  it has monocoherent rays of light  running parallel with maximum effect on vessels various indications of laser in ophthalmology are    Laser-assisted endoscopic DCR In c simple glaucoma ALT argon laser trabeculoplasty, laser iridotomy in a c glaucoma, excision of pterygium with argon laser other indications are  hypertensive retinopathy, diabetic retinopathy,  Eales disease, coats disease, VHL disease, retinal military aneurysm, malignant melanoma of choroid, metastatic lesions in choroid from ca breast tumors, ans cysts of iris, surface tumors of eyeball …