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What is wide angle rear window fresnel lens? A clear wide-angle rear window fresnel lens is a thin flexible negative fresnel lens which adheres instantly with water to the rear window of your vehicle to provides driver a increased angle of full view. The lens enable you to actually see many objects under the rear window you can't not see through inside and outside rear view mirrors. Use the rear window fresnel lens, you can avoid accidents due to the children, pets and other low-lying objects in blind spot behind your vehicle while backing up. The lens can also be applied on a side window for larger vehicles to aviod squeeze accidents.