High levels of free radicals can damage cells, including those in the lens of the eye.

高浓度的自由基会损伤包括晶状体细胞在内的各种细胞。

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Smoking may damage the lens of the eye by leading to the formation of chemicals called free radicals.

吸烟的过程会产生一种叫做自由基的化学物质，从而损伤眼内的晶体。

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Along with its consumer products, Opti-Free contact lens solution and Systane eye drops, Alcon also manufactures surgical equipment and implantable lenses.

除了生产隐形眼镜配套产品Opti - Free护理液和Systane眼药水，爱尔康还制造手术器械和可植入式眼镜。

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By employing a specialized lens-free technique, the researchers have created a system that is able to cope with the flood of radiation from an environment filled with flames as well as smoke.

ENGADGET: Infrared holography lets rescuers see people through walls, fire, walls of fire (video)

Word Lens, which is free, only includes Spanish and English but more languages are to come.

FORBES: Morning Tech Wrap: Mac Store, Nokia, Yahoo!

The Lumia 820 offers the same exclusive content as the Lumia 920, including Nokia Drive, a turn-by-turn voice navigation solution, Nokia Music, a free music streaming service and Nokia City Lens, an augmented reality application that uses the phone's camera viewfinder to provide information about points of interests in the surrounding area.

ENGADGET: AT&T prices Lumia 920 and 8GB HTC 8X at $100, Lumia 820 at $50, Nokias due on Friday