If you lost your eye sight through an accident or disease and you were offered the chance to get it back, would you take it?
And if you were born totally blind and had the chance to experience sight, would you take it?
The answer to both these questions might seem obvious, but they’re not.
In a two part series called ‘The Blind Brain’ on ABC Radio National’s ‘All in the Mind’ program, these questions are explored. A man who lost his sight many years ago as a young person through an accident said emphatically that he would not want his sight restored through the use of computer technology, such as chips and bionic eyes. On the other side of the coin, a man born without sight said he would jump at the chance.
What is the difference?
Having lost my sight later in life, I can see the issue very clearly. The first gentleman interviewed spoke about how his brain or mind’s eye has taken over the function of his sight. He ’sees’ everything around him three-dimensionally and in colour. If he is pouring a cup of coffee, he has to look at it, or he will spill it. To ’see’ what is behind him, he has to turn around. He spoke of his world as once being rich with true vision, but now being even richer and sharper with the images he sees around him constantly. And, of course like me, he dreams in full vision.
Before I go into the second man’s case, let me explain this further. Scientists have discovered something critical about our brains. We have an area called the visual cortex which takes up thirty percent of the brain. This area, as it sounds, is responsible for vision. The recent findings by scientists is that when someone loses their sight, the visual cortex does not stop working, but becomes involved in creating images through the use of the other senses. It has shown that the brain is adaptable to changed circumstances, and this is very exciting.
All this makes perfect sense to me, because I still feel that I can see. In fact, I feel my sight has improved and become sharper. For example, I have vivid images of photographs that I know were taken after I’d lost my sight, but I feel that I’ve seen them. My brain has taken over, recreating those photos for me.
Now for the second case - the man born totally blind. It makes sense that he would want to experience vision of any kind, as he has never had the chance. The type of artificial vision the scientists say they will be able to produce will be patchy and distorted. The reason for this is that the eye is an incredible structure that has so many functioning parts, it is impossible to reproduce it. They say that someone with this kind of artificial vision may not be able to distinguish between a cup and an orange.
When I was losing my sight, it was patchy and very limited. But I still tried to use it. Because I was struggling to see, my other senses couldn’t kick in, as they have now, because I see nothing at all. Now I can sense things around me such as trees, walls and people, and my hearing has become acuter. If I was given this distorted artificial vision, I would lose the clarity of vision that I have now.
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