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My husband also has difficulty telling the difference between green and blue. Particularly when the colours are blueish-green or greenish-blue. He says he also has problems with contrasts and find it difficult to evaluate depth. Maryse Sharon & Jim LeBlanc a écrit : > My husband has Parkinsons and is Blue-yellow color blind. He can't tell the > difference between blues and greens. > I realize that Parkinson visual problems in focusing are centered in the > basal ganglia. > But color Blindness has to do with Rods and Cones of the Retina. > Parkinsons has been related to a defect of NADH and NADPH. > NAD effects the retina. > > Pub Med : Impaired locomotion and dopamine signaling in retinoid receptor > mutant mice - Science 1998 > "Thus, retinoid receptors are involved in the regulation of brain > functions, and retinoic acid (Vitamin A) signaling defects may contribute > to pathologies such as Parkinson's disease." > > So some people that have Parkinson's disease may have it not because of > faulty dopamine receptors, but because of retinoid signaling defects. > > I was just wondering how many Parkinsonians are color blind too? > > [log in to unmask]