From the Mill Hill School site:

It is estimated that between 10 – 15 per cent of the population are affected by dyslexia. Some 4 per cent are severely affected and may never be able to read fluently, even as adults. Dyslexia is not a disease, like measles, that people can recover from. However, an early diagnosis and appropriate support will make a positive difference. Here’s a list of famous dyslexics…

Pretty short list that though, there are many more to add, but I’m just the messenger here 😉