I think the "duty" to disclose only really arises if you need the employer to provide some level of accommodation to do the job. If your AS is not prevalent enough to be noticeable at the interview, odds are you can do the job without asking for accommodations...at least not until someone makes it a problem. Since AS typically causes problems in interactions with others, most of us just need someone to be understanding of why we come across as so odd at times. That's not much to ask for.
However, if you can't handle being around fluorescent bulbs, needs special equipment, etc., if you conceal that need in the hiring process then demand it upon being hired, they could withdraw the job offer on the basis that you required accommodation that was "unreasonable" but represented otherwise in the application process.
Generally, most places do not ask at all, but the most any will ask is if you have a disability which can not be compensated with via reasonable accommodations. It's a major gray area because obviously if you say that is true, you eliminate yourself from the hiring process. If you say, "no," it's really a judgment call on what YOU think is "reasonable." It presumes you know what the job expects from you (not unfair since most applicants should know the nature of the work they seek to be employed in) and know that any disability you have will not be a serious complication, but really, the "reasonable" issue is one of fact that varies from situation to situation.
Of course, when in doubt, don't disclose unless you know it's obvious you're disabled or they'll find out very quickly.