Because maximum field of view in telecentric systems directly relates to the lens aperture closest to the object, larger front lenses are necessary for larger fields of view.

由于在远心系统中最大视场直接关系到镜头的镜头的光圈到物体之间的距离，若需要大的视场就必须要有大尺寸的前置镜头。

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Skin cells just in front of them differentiate to form lenses .

它们前面的皮肤细胞就分化而形成晶体。

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Refraction - Using an instrument called a phoropter, your optometrist places a series of lenses in front of your eyes and measures how they focus light.

屈光状态检测——通过使用综合屈光检测仪，验光师将一套镜片放在眼镜的前面测量出眼球是如何聚焦光线的。

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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