People ask me all the time how does brown pigment make your eyes look blue? This is where it gets a little more scientific. There are different layers of the iris. A layer in the front of the iris is called the stroma and a layer in the back is called the epithelium. Blue eyes and brown eyes have the same amount of pigment in the epithelium. But if the stroma cells have very little pigment then the shorter blue wavelength of light interacts much more than red wavelengths and the blue light radiates throughout the iris causing it to look blue.