| By Max Campbell July 11, 2017Jaynard, a young boy affected by achromatopsia, or total color blindness. |
| 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. |
| In rare instances when V4 is damaged, the affected individual develops central achromatopsia, the inability to see or even imagine colours despite a normal trichromatic retina. |
| The symptoms of achromatopsia, which also include reduced visual acuity and severe photophobia, or sensitivity to bright light, became common on the island. |
| The genetic cause has been determined for several color vision defects, achromatopsia, blue monochromatism, protanopia, deuteranopia, and enhanced S-cone syndrome. |
| A few years ago, after speaking on Belgian radio about her work on, and interest in, site-specific genetic anomalies, De Wilde received an e-mail from a listener with achromatopsia. |
