There's certainly a large amount of anecdotal evidence that a decent percentage of dyslexic people benefit from using Comic Sans. I don't know if there has ever been a formal study though.
There's also a view that all dyslexia doesn't have a single cause. If that is true, then there may be different things that are helpful depending on the exact cause.
There's also a view that all dyslexia doesn't have a single cause. If that is true, then there may be different things that are helpful depending on the exact cause.