Phakomatoses are a multidisciplinary category of systemic diseases that is often tested for a multitude of reasons. Although the incidence of these conditions is fairly low (though chances are you will see at least 1 case of many of these conditions), there are many ocular findings that need to be considered.
I've been debating how to organize this information in a useful manner for review for quite some time. The subject material is pretty massive, and each condition could easily take several articles (and probably eventually will). But I wanted to make sure there was a useful review out there on this subject before the written board exam, in case the test covers one of these conditions.