There seems to be a wide array of different abilities that are seen as disabilities by able-bodied — or “normal” people — like being 
blind, deaf,wheelchair bound, missing a limb or part of a limb, and a wide spectrum of mental “conditions” like bipolar, schizophrenia, autism, Aspergers, depression, dyslexia — and ADD. A “disorder” (the last D in ADD or ADHD) is seen as something that is broken in someone, rather than it being seen as an indication of different, sometimes even superior, abilities.
