People With Brown Eyes are Likely to Change Green shows New Science and Medical Research from the University of Cambridge.

New research suggests that due to the high concentration of artificial chemicals in our everyday lives, skin, hair and eye colours can change subtly or drastically over time. People with naturally paler skin reported gaining summer tans in the middle of winter. Darker hair colours are being bleached by chemicals and gradually becoming lighter. But more than any other colour, brown or hazel eyes are turning green all across the globe. While eyes can change colour due to many factors including illness, age, strokes, environment, surgery, or even just genetics, never before did we think that atmospheric chemicals would be on the list! So, if you notice your brown eyes becoming lighter or greener, do not be startled, there’s a good chance its just the air around you.