Even something that seems obviously biological, such as blindness, is not objective in biology. Some sightless people do not think of themselves as blind, because they get around in the world just fine.
This sounds truthy. This is a very poor understanding of blind people. They do think of themselves as blind! Many just don't see blindness as a lack of something, and identify society rather than blindness as what causes problems for them! Deaf people also don't see being Deaf as inherently lacking!
