<prompt> If the axial length of the eyeball is changed by limn then the power changes by:1 dioptre2 D3 D4 D  <response>: C i.e. 3 Dioptres A decrease in 1 mm in curvature of cornea leads to hypermetropia of 6D while 1 mm decrease in length leads to hypermetropia of 3D.Q 