> So I have a question, so even if it's Alt Text, how would a blind person even
> see to read?

Minh,
Apart from screen readers that others have mentioned, there are also devices
such as refreshable braille devices, which transfer text into braille:
http://www.flickr.com/photos/russweakley/58957885/

It might be worth having a read of this article that outlines the various
assitive technologies and how they are used:

Disabilities and Technologies
http://www.usability.com.au/resources/statistics.cfm

There is also a quick and dirty version here:
http://www.maxdesign.com.au/presentation/accessibility/04.htm

HTH
Russ

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