Domain Experts / Subject Matter Experts / Industry Experts have invaluable knowledge that you can (and should) apply during your UX process. Domain expert involvement is not an alternative to UX research, and a domain expert is certainly neither a “user expert” nor a designer.
Interviews
Domain Expert Interview — UX Knowledge Base Sketches
The goal of accessibility is to design & code digital products, services in a way that users with disabilities are able to use them. Your context or temporary condition and limitation also affect the way you use a product.