"Then, to simulate a real-world camera, a lens-distortion is performed on the image by using a small pixel shader. It does not only distorts the image, it also introduces small chromatic aberrations on the edges of the frame, by slightly distorting more the red channel compared to the green and blue ones."

Why would the engine do this? Is it to try and give a 'cinematic' feel to the game? Do our eyes suffer Chromatic aberration?