I don't know any specific research regarding "Comic Sans" and dyslexics, but there are at least a few fonts designed by and for dyslexics to ease reading. Two examples are the free [OpenDyslexic font][1] by Abelardo Gonzalez or the commercial [Dyslexie font][2] by Christian Boer.

Christian Boer is a dyslexic, Dutch graphics designer, who has used his own experiences as a dyslexic and feedback from dyslexic friends to create a font, which tries to avoid typical problems. On his web page, he has [summarized many of his design decisions][3] and at least a few of these design principles can be found in "Comic Sans" as well, e.g:

* The letters have a "hand written" appearance, to make otherwise similar letters more distinct. The letters n and m are e.g. very different, since the vertical strokes of the m are slanted.

* Letters, which are often mirrored or flipped in other fonts (e.g. b, d, p, q), have distinct features, making them easier to distinguish.




  [1]: http://dyslexicfonts.com/
  [2]: http://www.studiostudio.nl/
  [3]: http://studiostudio.nl/?portfolio=item-14-4