<prompt> Cataract brunescen results due to deposition of?UrochromeCopperIronSilver  <response>: Ans. is a i.e., Urochrome Nuclear sclerosis also distos color vision because of - yellow -brown urochrome pigment, which accumulates in the lens and filters out blue wavelengths of ight. -- Eye pathology Older nuclear cells lose organelles and cell membranes, with increasing density and dehydration and accumulation of yellow urochrome pigment possible photo-oxidation product. Pathology shows homogencity of nucleus , with loss of cellular lamination and increased eosinophilia. o When advanced, it becomes brown brunescent or black cataracta nigra. 