Have you ever written a character with physical or mental disabilities? Describe them, and if there’s nothing major to speak of, tell us a few smaller ones.
Not really, and not yet.
If you want to get pedantic, I suppose Catrina’s encounters with the Creature in her head could be classed as a form of Multiple Personality Syndrome, but that’s debatable, because — as I’ve said already — we don’t know at this stage whether the Creature is actually real or not.
I haven’t worked out whether them being blind would actually contribute anything to the story or whether it would just be something ‘cool’ (I suspect the latter), which was my reasoning for having it in the first place.
If you are interested in doing your own 30 Days of Writing, here are the questions.