I know sighted people like that who became hams. It is not the job of any
organization or individual to screen out fools. I was upset when a blind
guy here got his ticket in the 80's with out learning the code. He
convinced a VE that he couldn't do that since he was blind.
he never operated, I think because he didn't value what he didn't have to
work for.
Some disabilities are not visible, but they are much more disabling than
vision loss.