<prompt> Laser used in LASIK -YagDiodeExcimerNone  <response>: Ans. is c i.e., Excimer o PRK, PTK, LASIK and LASEK use excimer argon fluoride laser.Lasers used in ophthalmologyLaserWavelength nanometerClinical applicationsNd: YAG Neodymium - Yttrium-1064Posterior capsulotomy, iridotomy, vitreolysisAluminium- Garnet Frequency- doubled Nd:YAG532Retinal photocoagulation, cyclophotocoagulationArgon green514Trabeculoplasty, iridoplasty, pupillomydriasis, retinal photocoagulationDiode laser800Retinal photocoagulationKrypton red714Retinal photocoagulationExcimer argon fluoride193Photorefractive keratectomy PRK, phototherapeutic keratectomy PTK, LASIK, LASERFemtosecond laser neodymium-glass1053Femtosecond laser assisted refractive surgery, lamellar and full thickness corneal transplantsRetinal photocoagulation includes treatment for diabetic retinopathy, other causes of retinal neovascularization or retinal oedema, retinal breaks, central serous retinochoroidopathy, subretinal neovascular membranes, small retinal tumours, angiomas, etc. Argon green laser is the most widely used but other lasers are increasingly being used as substitutes in certain situations. 