By Michael Hanlon / Source: The Guardian
For blind people to regain the power of sight usually requires a miracle - either of the old-fashioned, Biblical variety or of the modern, medical sort.
Yet an extraordinary case reported this week shows us that there may be another form of miracle that can help the blind to 'see' - and it's one that may force us to rethink our whole understanding of the way in which the human senses operate.
In the journal Current Biology it is reported that a man left totally blind by brain damage has astounded scientists by flawlessly navigating an obstacle course without any help or practice whatsoever.
This is perhaps the most persuasive example to date of what is termed 'blindsight' - the extraordinary ability of some who have lost their vision to be able to 'see' without, apparently, any ability actually to receive images in the eye and brain at all.
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