I used the software I linked to above (I'm not blind), you can download it to a laptop, plug in a webcam and earphones. I could tell the difference between a car and a garbage can with no practice at all. Can he click with his tongue and tell if the picture on the wall is a picture a square or a circle? No, this software can enable him to do that.

I'd like to get his opinion of this: http://www.seeingwithsound.com/