Italian craftsmen learned how to precisely mill these reading stones, and by 1286, they were making lenses that could be held in a frame in front of a person's eyes.

FORBES: Magazine Article

Prior Heroes are silver boxes with stubby fisheye lenses jutting out next to a 2-centimeter monochrome LCD display on the front.

ENGADGET: GoPro Hero3 Black Edition review: taking action cam quality to the next level

Among the features shared with the Nokia Lumia 920 and Nokia Lumia 820 are exclusive camera lenses that transform the creative power of the Nokia Lumia 620's five megapixel main camera and VGA front-facing camera.

ENGADGET: Nokia Lumia 620 announced: 3.8-inch WVGA display, 5MP camera, $249