Use bifocal or varifocal lenses may relieve the asthenopia. An clinical investigation on the effect of progressive lenses for juvenile myopes

He also made the first pair of bifocal glassed and invented a musical instrument called the glass harmonica and the stepladder chair.

他还制作出了世界上第一幅双光眼镜，发明了玻璃碗琴和活梯。

In order to efficiently provide interpretations more precise amplitude-reserved section, we studied amplitude-preserved processing based on bifocal version of CFP technology and its parallelization.

为了能够高效率的为解释工作提供可靠的保幅剖面，开展了双聚型CFP保幅处理及并行实现的研究工作。

The entire arrangement makes it easy for this bifocal fish to spot a tasty bug flying above the water, or a bit of algae below.

由于这一系列动作使这双聚焦的鱼较为容易地发现在空中飞行美味的小虫或者是水下那一点点的海藻。

He had beautiful skin, with rosy cheeks, blue eyes, rimless round bifocal spectacles, resting on the tip of his nose.

他皮肤很好，面颊红润，眼睛深蓝，鼻梁上架着一副无框双焦眼镜。

Nowadays, these glasses are known as bifocals.

如今，这些眼镜被称作双光眼镜。

No one before had thought of bifocal glasses.

以前无人想像双焦点眼镜。

Take care when stepping on and off the escalator; take extra care if you wear bifocals.

在上下扶梯的时候一定要留神，尤其是当你还戴着眼镜的时候。

A Monocular Stereo Vision Algorithm Based on Bifocal Imaging

基于双焦成像的单眼立体视觉算法

If you are both short-sighted and long-sighted, you need bifocal spectacles or contact lenses.

如果你既是近视又是远视，你就需戴双光眼镜或隐形眼镜。

Depth estimating algorithm and precision analysis of bifocal imaging without principal point calibrating

无标定主点坐标的双焦测距算法及精度研究

Finally, a bifocal wide angel lens antenna is designed successfully by using Geometric Optics ( GO) method and commercial software MATLAB.

利用几何光学方法结合数学仿真设计软件MATLAB，成功设计出一副双焦广角透镜天线，并给出了设计方法和最终的设计参数。

Objective: To study the effects of gradual distraction of growing bone ( distraction osteogenesis) with bifocal distraction for segmental mandibular defect.

目的：观察自行研制的转移盘牵引成骨器（bifocal Distraction Osteogenesis）整复山羊下颌骨节段性缺损的治疗效果。

Bifocal chord of a quadric Attenuation, Scattering, Modeling water surface, Light shafts, Caustics.

二次曲面的两焦点弦衰减，散射，水面建模，光线束，焦散。

People who wear bifocal glasses know all about how the distorted view they get when looking downwards at the ground.

戴双焦眼镜的人知道往地下看的时候怎么是看到歪曲的景象。

CFP ( Common Focus Point) imaging technology contains confocal and bifocal version.

CFP成像有共聚焦和双聚焦两种形式。

Or would you like bifocal with no line this time?

还是这次要不带线双焦点的？

This paper analyzes the monocular stereo vision algorithm based on bifocal imaging.

对单眼立体视觉的双焦成像算法进行了分析。

Design of a refractive/ diffractive hybrid infrared bifocal optical system

折射/衍射混合红外双焦光学系统设计

Manufacture technology of insert of bifocal optical plastic aspherical cylindrical collector

光学双焦非球面圆柱面塑料集光透镜模芯制造技术

Clinical observation on treatment of heart failures with right ventricular bifocal stimulation

右心室双部位起搏治疗心力衰竭临床观察