Is it normal I can't decide whether my eyes are green or blue?

I once asked this to an Optometrist when I got my glasses and he told me that eye color, especially colors as light as ours is, actually DOES change in shade. This can be due to lighting, comparison of color (wearing brown or black eye makeup with make my eyes look blue but green eye makeup makes them look green) or to blood flow (similar to how the blood flow in your face can make it seem either really pale of really red, he said that this is why it IS possible for eye color to change due to mood as increased or decreased blood flow can change the shade of the iris slightly).