I have a pair of BIP polarized OEM Oakley lenses, and the inside of the lens has a greenish tint when light is shined on it. I have seen this before on other BIP lenses, and I am wondering what causes this. I know they are real, because The polarized etching is perfect, and the optics are fine, but i did notice the cut edges are clear instead of being dark, which leads me to believe that these were possibly custom cut. The greenish tint cant be seen when worn, only away from my face. Any thoughts?