Here's an interesting video: www.youtube.com/watch?v=OrcO2oRv75I
Here's where I ordered my glasses (I got the cheap ones) http://www.colorglasses.com

Here's a site with a good discussion about the glasses
http://www.parkinsons-information-ex...chive/220.html

Here's a post from someone who seems to have the "recipe" for coloring the lenses.
From: Virginia & David Herd <stormee@IX.NETCOM.COM>
Subject: BLUE GLASSES TECH INFO

I have been an Optician for 14 years. My dad was Diagnosed
with Parkinson's about a year ago. After seeing all the info
on Blue Glasses here, I decided to make up a pair for my Dad.
So here's the technical info your optician must use exactly
or the tint won't be the correct shade or intensity.

TINT -- BPI BLUE (2 bottles to 1 quart of water.
Must be freshly mixed!!! Tint even
2 days old will not give the appropriate
results!!)
LENSES-- CR39 PLASTIC (These are standard plastic lenses.
You cannot use those light weight
lenses -Hi Index or Polycarbonate
for this tint! They will not tint
properly.)
TIMING--2 HOURS (It will take right at 2 hours in the tint
solution for these to be dark enough to be
effective.) ***They will be DARK***
INTENSITY--50 % LIGHT TRANSMISSION (These would be classified
as sunglasses in the optical industry.
These degree of tint **#3 Blue** is
dark and may be too dark for individuals
with cataracts. Hopefully your optician
will be willing to work with you in
acheiving the intensity you need.)

The color that these will turn out to be will be quite shocking
to look at to the average person. But once you put them on they
are so soothing that you will wonder how you ever got by without
them.