With respect, the law recognizes a wide range of disability. Mr. Hansen has a visible physical disability and is the champion of accessibility for the physically disabled: he is rightly much admired for representing these issues and identifying the need for change.

There are other invisible injuries and illnesses that cause disability: Brain chemical disorders that causes diabetes, depression, dyslexia, PTSD, etc. just as physical in nature but much more prone to discrimination because people cannot see it, as you have identified by your comment. The discrimination faced by these disabled people is extraordinary: they are often treated horribly because of a belief they are faking and have high incidence of being unemployed as employers know how to get around the law. Accommodation is often denied due to cost, as this is one of the considerations.