And we discover that when he is blinded there is no physical reason for his disability.
On some subconscious level he has chosen not to see, and when he is given a device which enables him to see, after a fashion, it is in black and white and works on the same principle as sonar, that is it reflects back the signals he sends.
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The concept of blind Justice is on one level a reassuring one since everyone is equal irrespective of race, creed, power etc.