I suppose it could be my own vast ignorance, but I'm not sure I would find any of these tests convincing. I can clearly see Chinese characters but they mean absolutely nothing to me. They can be as in focus and lovely as you like and they're still going to bounce off the back of my head with a meaningless thump.
However, to come back to my example from a previous posting: I can take a very bad fax and do a pretty nice job of deciphering it, based on partial words, partial letters, etc. My OCR software couldn't come close. Just by determining what I'm seeing, you would not be able to judge how capably I would process that information. Even if my peripheral vision does a mediocre job of capturing the image, it's still quite possible that whatever part of me does the analysis would be able to come up with the goods.
Does that make any sense?
