Colour Blindness

In the world where the colour of your dress or coat of arms or flag - or even the colour of your food - is important to your day to day survival, being born without the ability to discern between them might prove a significant disadvantage. Despite this limitation, people always find a way to live a somewhat normal life, but that also depends on how serious one's condition is.
There are different kinds of being colour blind but the most common case is people to whom green and red colours seem completely the same. The most sever case is considered to be when a person is born with the ability to only be able to distinguish between the shades of grey - they basically only see white light, complete darkness, and all of the greyness in between but not a single bit of a different colour.
Most of the people who are born being colour blind might not even notice that to them the world looks slightly different. While words can have very specific meanings, most people do not really care if a pink shade is called salmon or peach. It is just a shade. But for some people this issue is a bit more complicated especially if you on a lookout while sailing and need to be able to spot different flags very quickly, or if you are a cloth merchant and need to be able to distinguish between what is currently fashionable and what is not.
While this condition is not physically affecting the life of someone, it can make for some unusual and funny misunderstandings. There might be some magical and lense contraptions that can aleviete some of it, but most people just decide to live as is and not really seek a remedy that might not exist.