Colour blindness, also known as color deficiency, is the decreased ability to see color or differences in color. It is a common condition that affects millions of people worldwide. There are different types of colour blindness, and it can range from mild to severe. Those with mild colour blindness may have difficulty distinguishing between certain colours, such as red and green, while those with severe colour blindness may only be able to see in shades of grey.
There are a number of different ways to check for colour blindness. One common method is the Ishihara test, which uses a series of coloured plates with numbers or shapes hidden within them. People with colour blindness will have difficulty seeing the numbers or shapes in some of the plates. Another common method is the Farnsworth-Munsell 100 Hue Test, which requires the person being tested to arrange a series of coloured chips in order from lightest to darkest. People with colour blindness will have difficulty arranging the chips correctly.
