Why do my eyes change from green to blue to grey almost daily?

My eyes are light brown, but often change to blue, green or grey why is this?

• My sisters do it too, but doesn't seem to matter what we are wearing, We think it's our moods but we don't know

• Answer:

  They don't change. They CAN'T change, the pigment that makes your eye colour is fixed... what changes is the light, which reflects different pigments different ways. Everyones eyes do this, light is made up of a prism of colours, so depending on the natural light, or artificial light, it will make your eyes look different. Your moods cannot change the colour of your eyes anymore than it can change your hair colour, teeth shape or height!