I have been on this list for months now, as my father has PD. Over the past several months there has been a lot of discussion of Blue Glasses and there effects on PD sufferers. I have verbally passed this information on to my father several times, but since his doctor has never mentioned it, and I haven't given him anything in writing, he thinks I am nuts. Therefore.... Could someone please provide me with any concise information on "Blue Glasses" that I can take to my father. Things like how to go about getting them, the darkness of the tint, the desired effect on the individual, and any other info I can use to persuade him to at least look into it. Thanks in advance. Dan Fagin