<prompt> Which of the following does not effect the refraction of eyeRemoval of vitreousThickening of lensIncrease in depth of anterior chamberChange in axial length  <response>: Answer- C. Increase in depth of anterior chamberDepth of anterior chamber has no role in refractive system of eye.Removal of vitreous will change the refractionThickening of lens will change the refractionChange in axial length has a large effect on refractive power of eye.The main function of refractive system of eye is to focus the light rays on the retina. 