A lot of disabilities are a sliding scale with fuzzy grey areas. E.g. visual impairment goes all the way from "struggling to distinguish colors" and "vision is

A lot of disabilities are a sliding scale with fuzzy grey areas. E.g. visual impairment goes all the way from "struggling to distinguish colors" and "vision is distorted enough that it's impossible to correct to 20-20" to "can't see hand in from of face"