Employers are not allowed to ask applicants about their disabilities, even if the disability is clearly evident. Employers may ask applicants whether they can -- and how they would -- perform the job's essential functions, as long as they ask all applicants these questions, not just applicants with obvious disabilities. If you will need a reasonable accommodation to apply for the job or to perform it once hired, you may want to bring that up during the interview. Otherwise, the employer may mistakenly assume that you won't be able to do the job because of your condition. For more information, see Nolo's article Getting Hired With a Disability.