Dave, In response to your question to Alan re: blue filters to calm his dyskinesia and asthma I will jump in and add my two bits. I am 50 year old woman with PD. My greatest problem with my PD used to occur when trying to walk (or breathe) in bright afternoon sunlight. I tried the blue filters and now have a pair of my prescription glasses tinted blue.......I have dramatic improvement in my movement while wearing blue glasses. (Might add that I tried this after having had lunch with Alan and Tom Reiss). I have a dramatic reduction in my rigidity, and fine motor skills when wearing the blue glasses. Do not know what is causing the change in movement. I have discussed this with several neurologists as of yet we have no answers. Try dark blue plastic or cellophane covering your eyes. See if you have any change in movement. I will also add that I experience very negative changes in my pd with other colors of filters. Do not try using these filters the first time when you are by yourself, just as a precaution. [log in to unmask] rita weeks