The ability to change colors of indicators

It would benefit all of us with vision problems. I am a baby boomer myself and my vision is not what it used to be. I cannot work on a white screen due to cataracts. I need the black background for the contrast. I just joined the Equites on demand course and the power play has an area fill on one line and I am having trouble dealing with the brightness. Also if an indicator has a line in black I cant see it at all. This would also benefit anyone who is color blind as well. My father-in-law was color blind. I can understand needing to keep certain parts of an indicator unchanged but being able to change just the colors should be standard on all indicators.