Maybe your parents or even teachers at school once told us that seeing the green scenery out there, such as trees or hills, has good benefits for our eyes.
So far, there seems to be no definitive research on the benefits of green on eye health, and still just a parent suggestion. However, actually see certain colors, including green, not just "refreshing" the eye, you know. Psychologically, green color has an effect on our mood and mind, and makes us feel more calm.