<prompt> Axial myopia is -Increase in anterio-posterior length of the eyeballIncreased curvature of corneaAnterior placement of crystalline lensIncrease in refractive index of crystalline lens  <response>: Ans. is a i.e. Increase in anterio-posterior length of the eyeball Etiological Classification of myopiai Axial- commonest Increase in anterio-posterior length of the eyeball 1mm increase in AXL-3D of Myopia.ii Curvatural Increased curvature of cornea, lens or both. eg. Keratoconus, Lenticonus 1 mm increase in radius of curvature- 6D Myopiaiii Positional Produced by anterior placement of crystalline lens in eyeiv Index Increase in refractive index of crystalline lens associated with nuclear sclerosisv Others Myopia due to excessive accommodation, Myopia due to relaxed or ruptures suspensary ligament or zonules. 