Axial myopia is -: (A) Increase in anterio-posterior length of the eyeball, (B) Increased curvature of cornea, (C) Anterior placement of crystalline lens, (D) Increase in refractive index of crystalline lens
Answer is A. 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.