It's not easy when it comes to colour pallets. I have tritanopathy - full on yellow-blue blindness - in my left eye. Thankfully my right eye is able to "fill in

It's not easy when it comes to colour pallets. I have tritanopathy - full on yellow-blue blindness - in my left eye. Thankfully my right eye is able to "fill in the blanks" for the most part, but there are times I really notice it. For example, at night green and blue lights from the traffic lights and the bus are the same colour - teal. I only know this because my right eye can see the blue properly, but if my vision is partially obstructed (visible only to left eye), I can't tell the difference. The bus line has probably never considered that in their choice of blue lights at night could be an issue for anyone with sight. But people with tritanopathy won't be able to see the difference between a stoplight "Go" signal and the bus, except of course by context.