1. For near vision: Ciliary muscles contract, suspensory ligaments become slack, tension on the lens decreases, lens becomes more convex, refractive power of the lens is increased
2. For distant vision: Ciliary muscles relax, suspensory ligaments become taut, tension on the lens capsule increases, lens becomes less convex, refractive power of the lens is decreased
Inability of lens to becomemoreflat/eyeballis longer thannormal, lens bends the lightraystoomuch, as a result it falls infront of the retina causing the image tobeblurred, cannot see distantobjectsclearly
Inabilityoflens to become moreconvex/eyeballisshorterthannormal, lens does notbendlightraysenough, as a result it fallsbehind the retina causing the image to be blurred, cannot see near objects clearly