How does the blur index work?

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Edit My Images
Yes
see here

http://www.slrgear.com/reviews/showproduct.php/product/215/cat/31

the blur index I understand etc, but what is it measured in? as in say one setting shows the image as number 2, and another as say number 5, is that a noticeable difference on the actual image? Its rated 0-12, and the link above has some horrific looking 10-12 at the 400-500 end and doesnt really some down 3 which is at f.22, which would be really slow?

am I reading into the blur index info too much?
 
One unit of blur corresponds to one "blur more" operation in Photoshop.

Detailed explanation here: How we test lenses.
 
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