Feb 14 - 15 | Can eyes change colour? Sure! A baby's eyes can absolutely change from blue to dark as the natural pigment (melanin) develops on the iris. Also an adult's iris colour can change dramatically based on the dilation/constriction of iris blood vessels. Mood, stress, exercise can shift colour like a mood ring. Green/Brown is a common shift. However red eyes are usually not a good thing! Come see us ;) dr.j StudioEyeCare.com