The Nike Hindsight glasses design uses Fresnel lenses, which were originally made for lighthouses and provide a wide aperture and short focal length. Even though the lenses reduce image quality, the idea is that since they are located only on the sides of the glasses, little clarity is lost in the process as the eye only detects motion in that area. Nike designed the glasses for cyclists, but the design could be handy in a more wide range of activities where detecting motion beyond the usual 180 degrees would prove advantageous. People such as marathon runners to track and field athletes could benefit from a few extra seconds of warning the glasses afford.
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