From the article: "Prof Monteiro said, “What is exciting about this research is that by using the comparative method in evolutionary biology, we find that many species of primates independently evolved bluer eyes at higher latitudes, just like what happened within our own species. This helps tip the balance towards an ecological, rather than sexual selection explanation, for the evolution of blue eye colour in humans.

Blue light helps us tune our circadian clock to adjust energy levels by stimulating special receptors in our retina. In geographic regions with less light, bluer irises may allow more blue light to reach those special receptors, thus boosting energy levels. This would help explain why blue eyes evolved and spread only far away from the equator." So yes.

The article was not fully comprehensive. It may be a segway Into future research. If this line of research continues they will likely look more closely at the different colors and their response to different environmental conditions. While there are people with all different colors of eyes all over the planet and population groups with light eyes at different latitudes and vice versa their are higher numbers with specific colors in certain regions. Eye color is typically not exclusive to one area but may be more common. For example you find blue, green, honey colored....etc eyes in Africa and brown eyes in Europe.