• Question: How does our conscience work? What happens if you are completely blind, and say your eyes have been removed, so what do you see? You can't see black, because you don't have eyes, so how does it work?

    Asked by eliotbenvie to Damien, Rachael, Simon, Suzi, Tim on 20 Jun 2011.
    • Photo: Suzi Gage

      Suzi Gage answered on 20 Jun 2011:

      Hi @eliotbenvie
      Believe it or not, you don’t actually need your eyes to see. You need your eyes to see the world around you, but there is an area at the back of the brain called the visual cortex, which is also involved. If you use a device to cause an electric impulse in this part of the brain, even blind people without eyes would ‘see’ something. Often it’s described as patches of light.

      I imagine that if you were blind without any eyes you would see black, as black is an absence of input in to the eyes, so your brain would interpret the lack of input as ‘black’ so you’d see black.

      But this is a guess.
      Hope this is interesting, what do you think would happen?

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