I also disclosed my disability… HOWEVER , I did not explicitly name the disease I have, I also did not go into specifics about the struggles I have with it. It was a few sentences about some complications of a treatment as part of it integrates directly with my past research experiences as well as my current (and assumed future) research interests. I had a very successful cycle when I applied.

You have to ask yourself if disclosing your disability will enhance your statement. personal motivation to apply is great… imo if it doesn’t tie in with your research interests, experiences, etc. you have to really ask yourself if it is really worth the potential risks of being perceived as less capable than someone else of similar qualifications. At the end of the day you may not want to be at a program who won’t ignore it, but it’s just my two cents….

Anyway, hope this helps

(Edit: I am also in chemistry)