I'll overlook for the moment that you have somehow still failed to grasp (or have chosen to ignore) the facts that:
1. Legally blind people rarely need canes or seeing-eye dogs.
2. The article is not about legalizing hunting by the legally blind but rather about legalizing the use of certain pointing/sighting devices by such persons.
And I will answer your question.
There is no law prohibiting the sale of a hunting license to a person in Texas who is legally blind. There is no vision test required to purchase a hunting license in TX.
The TX statutes are available online so you can check them yourself--this will eliminate the need for you to once again thinly veil your implications that I don't know what I'm talking about with feigned incredulity and repeated comments on how amazing/"whacky"/"nutty" the fact is.