In the eye are light receptors called cones and rods ... Some experts think it could be blue and yellow. Alexandra Horowitz — author of "Being a Dog" — told us that it's difficult to know ...

Light, especially blue-enriched light (which has a higher ... As we age, our eyes change: the lens becomes thicker and yellow, and our pupil size and number of photoreceptors reduce.

In art lessons, you might have learned about the three primary colours of paint which are different to the primary colours of light. In art they are: red, yellow and blue. Mixing the primary ...