dweste. You should try the EagleEyes' clip-ons. They do not alter any colors much (red is red, blue is blue, green is green - you just need to get used to it a little), they are enhancing them. Also they are great in changing light conditions including deep shadows, twilight and indoors. I can simultaneously see what's inside the house and what's around while looking from outside and even if in the direction of the sun. The eye adaptation time with them is very short in my experience.

Also because of these glasses I noticed that we have a wild apple trees in our park, the small apples became obvious between leaves with them. Hence the "Survival Glasses" in the head of the topic.