<prompt> Acquired blue blindness is a feature ofDisease of optic nerveDisease of maculaIncreased sclerosis of the crystalline lensAll of the above  <response>: Acquired Colour Blindness Acquired blue colour defect blue blindness : It may occur in old age due to increased sclerosis of the crystalline lens. It is owing to the physical absorption of the blue rays by the increased a.ambercoloured pigment in the nucleus. Ref:- A K KHURANA; pg num:-305 