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This undated product image provided by Second Sight Medical Products shows a new implantable device that takes the place of damaged cells inside the eye. (Associated Press/Second Sight Medical ProductsA)
Photo by: Uncredited
This undated product image provided by Second Sight Medical Products shows a new implantable device that takes the place of damaged cells inside the eye. (Associated Press/Second Sight Medical ProductsA)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.