Blindsight may also be experienced by healthy people when attention is elsewhere or the image happens too fast for them to become aware of it. The fact that a person will see it without being aware of having seen it can be exploited by advertisers as a form of subliminal messaging.
A person experiencing blindsight can be said to be lacking visual qualia.
A java applet about blindsight is available on the web here (http://serendip.brynmawr.edu/bb/blindsight).
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