There is so much more to the disabled community than just the physical aspect. Countless individuals with disabilities do not look like they are disabled, but have an invisible illness or disability. Therefore, the theme here should be to not judge a book by its cover.
Universal Design (UD) is an approach to design that increases the potential for developing a better quality of life for a wide range of individuals. It is a design process that enables and empowers a diverse population by improving human performance, health and wellness, and social participation (Steinfeld and Maisel, 2012). It creates products, systems, and environments to be as usable as possible by as many people as possible regardless of age, ability or situation.