Question: Does environment affect the colour of the eyes in humans?

Koko Mutai answered on 25 May 2018:

As for eyes colour is mostly determined by various genes, but we can say that there is something in the environment affecting one or more of the eye colour genes. There are lots of examples of things in the environment influencing how much a gene is turned on. Stress, for example, is known to affect genes important for the immune system. I’ve also read about certain foods affecting eye color