<prompt> Lens used to treat myopia isConvexConcaveCylindricalAny of the above  <response>: Ans. b Concave. Ref. Parson, Diseases of Eye, 18thpg.65MYOPIA SHORT SIGHTEDNESS Most common is axial myopia Clinically simple myopia is most common If refractive error is -6D, called high myopia, in which axial length is usually 26 mm. Pathological or degerative myopia is characterized by progressive AP elongation of the scleral envelope associated with secondary ocular changes pale tessellated or tigroid fundus, focal chorioretinal atrophy, Lacquer cracks, Lattice degeneration, Foster-Fuchs spots and staphyloma, maculopathy and Retinal detachment. Treatment- Optical-Concave lenses- Surgicala Radical keratotomyb Keratophakiac Keratomileusisd LASIK Laser assisted in-situ Keratomileusise Fukalas operationf Scleroplasty- Minus IOL- Excimer LASER Photorefractive keratoplastyPRK- Indications for LASIK:a Stable refractive errorb Age 21 yearsc Unsatisfactory result of non-surgical treatment 