Biases against those with disabilities are common enough that the government passed the Americans with Disabilities Act to prevent unfair discrimination. But negative assumptions about people with disabilities are the true barrier you are up against in the interview, no matter how many government agencies exist to back up your eligibility.
According to a Society for Human Resource Management survey, many respondents indicated that accommodating employees with disabilities presents difficulties for their organizations. Here are some specific comments:
"We are a small organization, and accommodation of physical requirements for disabled workers and time off for illness and medical treatment cause disruption to work and schedules."
"Some disabled workers are looked upon with disdain by their managers and peers. We have to overcome these attitudes."
I assume you will not seek a job that you can't or should not do. That, of course, would be foolish. So that means you are seeking a job that you are capable of doing, right? That being the case, you don't have a disability related to doing a particular job at all. The employer will still use his or her judgment in hiring the best person for the job, and that means people with disabilities have to compete for jobs along with everyone else. That is fair, so you need to present a convincing argument to employers for why they should hire you over someone else.
Most importantly, don't assume that the person chatting with you understands the technical details of your handicap. I see nothing wrong in casually mentioning how you have worked around your disability in other positions. Just remember to remain matter-of-fact in your explanation. If you avoid a defensive tone at all costs, you will not only put the interviewer at ease but also assure him or her that your future colleagues will admire your abilities and attitude, too.
Technology has provided opportunities to overcome disabilities in the workplace that you should become aware of. For example, speech-recognition software allows those who find keyboarding challenging (such as those with arthritis or other conditions that affect hand and wrist activity) to enter information into a computer, and magnification features in operating systems such as Windows allow those with visual challenges to more easily read text on a computer screen. You can use these low-cost options to overcome potential challenges to your disability on the job.
Tip: For more help on overcoming your disability in your job search, see the book Job Search Handbook for People with Disabilities by Daniel J. Ryan, Ph.D. (JIST Publishing).