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Vischeck is a way of showing you what things look like to someone who is color blind. You can try Vischeck online- either run Vischeck on your own image files or run Vischeck on a web page. You can also download programs to let you run it on your own computer. What is it good for? Roughly 1 in 20 people have some sort of color vision deficiency. The world looks different to these people: they often find it hard to tell red and green things apart. This often means that they sometimes can't see things that 'color normal' people can see (examples).