“In fact, I cannot conceive of any situation were a totally blind person would be safe with a gun. So I would deny the permit, just as I would deny a permit to a person who is a known psychotic and hears voices.”
Your lack of imagination is not a reason to deny citizens their Constitutional rights.
Again, it goes back to where you draw the limiting line for a Constitutional right. That line must be drawn a broadly as possible, giving the individual as much freedom as possible.
But no right can be unlimited and without boundaries. I suppose my original post was influenced by an NRA course I took many years ago. One poor gentleman in that class had a palsy so bad that when at the range, his pistol barrel swung wildly all over the place.
The NRA instructor finally, and gently, took the pistol from the gentleman's hand and told him that he was exempt from that part of the class.
I believe that the NRA instructor acted correctly in that case. And I believe that it would be correct to deny that gentleman a gun permit.