介绍了渐变多焦点眼镜的表面形貌特征和应用，叙述了渐变多焦点眼镜的测量以及数据处理的方法。
This paper introduces the character of PAL surface and its application, then describes a methodology of measurement and data treatment for PAL.
配戴近距离阅读附加双焦点眼镜的近视青少年近视增长速度明显低于配戴单焦点普通近视眼镜的近视青少年患者。
This study was to investigate whether the adolescent myopia can be controlled after they wear double-focus spectacles of near-distance reading addition.
方法：随机抽取昆明医学院眼科视光中心配戴渐进多焦点眼镜的青少年41人作为渐进镜组，同样抽取年龄相当的普通眼镜配戴者资料42份作为对照组。
Methods: 41 teenages wearing mutifocal lens were collected into mutifocal lens group and anther 42 normal glasses wearing teenagers were selected as normal control group randomly.
如果您戴眼镜，您就会知道，从光学的层面理解，焦点的意思是，将光线汇聚到您眼底的一点上。
If you have glasses you know that optically focus has to do with bringing the light to a focal point in the back of your eye.
眼镜都有一个光学中心，也就是说通过透镜的焦点看事物是最清晰的。
Glasses have what's called an optical center, which means that objects appear clearest when viewed through the center of the lenses.
“此前，金色眼镜蛇重在联合救灾行动，但焦点将逐渐转移到国际维和行动，”发言人说。
"Previously, Cobra Gold was focused on joint disaster-relief operations, but the focus is shifting to international peacekeeping operations," the spokesman said.
该鱼眼镜附件提供了一个约。角的15毫米的镜头意见，使您可以获取内的主题毫米，并且仍然在完美的焦点。
The fisheye attachment provides an approx. angle of view of a 15mm lens and allows you to get within a millimeter of the subject and still be in perfect focus.
该鱼眼镜附件提供了一个约。角的15毫米的镜头意见，使您可以获取内的主题毫米，并且仍然在完美的焦点。
The fisheye attachment provides an approx. angle of view of a 15mm lens and allows you to get within a millimeter of the subject and still be in perfect focus.
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