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Harbisson, who grew up in Barcelona, is colour blind, having been born with the rare condition achromatopsia, which affects one in 33,000 people.

Scdoris was born with achromatopsia, a rare vision disorder that limits her to seeing only blurry shapes of objects more than a few feet away and makes her acutely sensitive to bright light.

The sensor was originally devised to help him counter a rare form of colour blindness called achromatopsia, which affects one in 33,000 people and means he sees the world in greys.

He was born with a rare form of colourblindness called achromatopsia, which means he could only see in the grayscale with no ability to perceive colour.

She has achromatopsia, which limits her acuity to three feet and renders her extremely sensitive to light.