I confess to being partially colourblind, although obviously within limits, and, particularly in bright daylight, the indication is totally useless outside about 5 miles.
Well, I can tell you that I am not the least bit colour blind and still find the indication useless outside of 5 miles!
In poor viz, you may as well not have them. T-Vasis is far more superior, but realistically due to cost considerations we are stuck with it.