Squirrel monkeys, which are naturally red-green color-blind, can attain humanlike color vision when injected with the gene for a human photoreceptor. The research, performed in adult animals ...

Sharks are unable to distinguish colors, even though their close relatives rays and chimaeras have some color vision, according to new research by scientists in Australia. Their study shows that ...

A previous study that gave gene therapy to sheep used to model human achromatopsia found that the animals developed complete colour vision. In people with the condition, their so-called rod cells ...

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To the normal observer the blue figure is lost against the background, but the colour-blind person may spot it. Again, in the protanopic and protanomalous type of defect, ...