Various studies have shown that people who are born blind or developed blindness after having been able to see previously, usually 'see' or rather experience a form of blackness or 'nothingness'. This could either be the colour black itself, or a very blurred dark gray. Although they can't put it in context. They can also experience bursts of light.
However, always advancing technology has enabled some blind people to see with their mouth/tongue. Here is a video outlining how the device works and how it will benefit people in the future.
Implants might also help:
Retinal implant trial helps blind people see shapes - World - Video - 3 News
Furthermore this article suggests that the findings of a study shows that some blind people can partially 'see' with their ears:
http://www.kurzweilai.net/some-blind-people-see-spatially-with-their-ears
Yet another article discusses a study suggesting blind people can see during a near death experience:
http://www.near-death.com/experiences/evidence03.html
However, one vital question remains: HOW DO WE MAKE PEOPLE WITH THE ABILITY TO SEE VISUALLY AWARE OF HOW BLIND PEOPLE SEE IN ORDER TO UNDERSTAND?
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