Deutan colour-vision defects comprise deuteranomaly (anomalous trichromatic colour vision) and the more severe and less common deuteranopia (dichromatic colour vision). Deuteranomaly occurs if a ...

A little more than a year ago, on a trip to Nairobi, Kenya, some colleagues and I met a 12-year-old Masai boy named Richard Turere, who told us a fascinating story. His family raises livestock on the ...