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Four-colour vision research

Four-colour vision research

M450/0259

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Credit

COLIN CUTHBERT / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / SCIENCE PHOTO LIBRARY

Caption

Four-colour vision research. Researcher (upper right) watching a woman (lower right) undergoing a test for four-colour vision or tetrachromacy. This is a rare genetic mutation (on the X chromosome) that would form an extra type of cone cell on the retina. Only female tetrachromats are possible. The beams of light are used to investigate whether potential tetrachromats can perceive different colours to those normally seen. A mixture of red and green light appears yellow to (normal) trichromats, but it may look different when seen by a tetrachromat. Photographed at the University of Newcastle-upon-Tyne, England, in 2004.

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