Yesterday I bought at True Value a Rear Window Lens. According to its package, using the same will enhance safety since you will "see everything behind you car" and that it can be use for paking safely your car. I then installed it as instructed in the package, but to my dismay, I can only view the rear part around 2 meters away. In other words, walang kwenta itong Rear Window Lens or mali ang installation ko. Has anyone tried this product?