croldfort: I think Fish Head is on the right track. All eyes are not the same. Color blindness can be incremental. Sight in general is subjective.
We had a thread on target colors and different people (eyes) could see different colors better. If you haven't, go to a sporting goods or gun store and try different colors and see which YOU can see better. I think they will let you look into a dim room or into bright light.
My personal preference is orange BUT it might not work well for you.
JWALL
_____________
VEGETARIAN.......Indian Word For Poor Hunter