I was diagnosed with blue/green color blindness. Don't know how they came up with just those two colors b/c everytime I have to take one of those color tests with all the dots that supposedly have a number or letter blended in, I fail it miserably. I have trouble with colors that are close in color like Navy blue/black, light green/yellow, reds & oranges, etc. Yeah, blood trailing really sucks for me. I upgraded my gun to a 300 win mag simply so I wouldn't have to blood trail. They don't run far when that hit's 'em.