It’s estimated that there are 300 million people who are colour blind in the world! Colour blindness is a deficiency in the way you see colours such as blue and yellow or red and green. There are three main types: Deuteranopia Vision, Protanopia Vision and Tritanopia Vision. The deficiency occurs when light-sensitive cells in the retina fail to respond appropriately to variations in wavelengths of light that enable people to see an array of colours. It is far more common in men than in women with 1 in 12 men being colour blind while only 1 in 200 women have the condition.