It has a lens system to focus light onto the film at the back of the camera.

它的镜片系统可以将光线聚焦到相机后部的胶片上。

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This happens when the back of the lens capsule - the part of the lens that wasn't removed during surgery and that now supports the lens implant - becomes cloudy and impairs your vision.

它的发生是由于晶状体囊的后部——在手术当中为了用于支撑人工晶体而未被摘除的晶状体部分——变得浑浊，从而损害您的视力。

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Every few installments, I'll pull the lens back a bit to capture some aspect in the landscape of such sites.

在随后的每一期中，我都将镜头稍作后移，以捕获这些站点背后的一些方面。

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The artist draws her lens back just far enough to show us that the scene is from a Korean amusement park featuring huge fictitious backdrops.

WSJ: Too Clever by Half | More Real? | Minneapolis Institute of Arts | By Peter Plagens

This means the rear lens elements are as close as possible to the sensor, reducing the back focus distance of each lens to the minimum possible, thus achieving high resolution from edge to edge.

ENGADGET: Fujifilm grows X-series mirrorless lineup with 16.3-megapixel X-E1

In back, the collapsible zoom lens, xenon flash, and aluminum battery cover mimic a point-and-shoot camera.

ENGADGET: Aigo A8 / Leo 14 megapixel cameraphone hands-on (video)