<prompt> In posterior capsular cataract, treatment isKrypton LaserNd-YAG LaserArgon LaserCO2 Laser  <response>: B i.e. Nd-YAG laser Nd. YAG Neodymium-Yttrium-Aluminium-Garnet laser is used for posterior capsulotomy in after cataract.Q After cataract Secondary cataract Posterior Capsular Opacification PCO - It is the opacity which persists or develops after ECCE - It may present as thickened posterior capsule or dense membranous after cataract or Soemmerings ringQ thick ring of after cataract formed behind the iris, enclosed between the two layers of capsule or Elschnigs pearlsQ vacuolated subcapsular epithelial cells are clustered like soap bubbles along the posterior capsule - It is treated by Nd-YAG-laser posterior capsulotomyQ Neodymium-Yttrium-Aluminium-Garnet laser or surgical membranectomy Laser Wavelength nm Clinical Application of LASERS in Ophthalmology Nd: YAG 1064Q Posterior capsulotomy Q, iridotomy, vitreolysis. Femtosecond laser 1053 Refractory surgery, lamellar corneal surgery. Diode laser 800 Retinal photocoagulation Krypton laser 714 Retinal photocoagulation Frequency doubled Nd: YAG 532 Retinal photocoagulation, cyclophoto-coagulation Argon green 514 Retinal photocoagulation, trabeculoplasty, iridoplasty, pupillo-mydriasis Excimer Argon-fluoride 193 Photorefractive keratectomy PRK, phototherapeutic keratectomy PTK, LASIK, LASEK Retinal photocoagulation includes treatment for diabetic retinopathy, other causes of retinal neovascularization or oedema, retinal breaks, central serous retinochoroidopathy, subretinal neovascular membranes, small retinal tumors, angiomas. Argon green laser is m.c. used for this. 