 The slits in the parallax barrier allow the viewer to see only left image pixels from the position of their left eye, right image pixels from the right eye.When choosing the geometry of the parallax barrier the important parameters that need to be optimised are; the pixel – barrier separation d, the parallax barrier pitch f, the pixel aperture a, and the parallax barrier slit width b.The closer the parallax barrier is to the pixels, the wider the angle of separation between the left and right images.