Fun fact, most people in the world are trichromats, they have 3 types of colour sensors in their eyes. One type of colourblindness that only affects men is where they only have 2 types of sensor and are dichromats - the gene is only found in the X chromosome, and it’s impossible for women with two X chromosomes to get the deficiency. However, it’s possible for women to get super genes and have 4 types of sensor, making them quadchromats. These ladies can see colours in between two other colours, that no one else can see. However, because the world is built by and for trichromats, this gift goes by largely unknown even by the people who have it.