After the procedure, your cornea should bend (refract) light rays to focus more precisely on your retina rather than at some point beyond or short of your retina.
完成手术程序后的角膜可以使光线更精确的发生折射，形成的焦点位于视网膜上，而不是超过或者达不到视网膜。
This is because, with a broad source, light rays hit your subject from more directions, which tends to fill in shadows and give more even illumination to the scene.
这是因为光源越广，射在物体上光线的方向就越多，这会起到增加场景中的照明、减少阴影的作用。
When you are short-sighted, your eyes focus well only on close objects, while more distant objects appear blurred. This is because light rays focus in front of the retina.
近视是指一个人对近距离的物体比较容易看清而远处的物体看不清楚的现象，它的产生是由于光线的聚焦点落在了视网膜之前。
When light from an object such as a machine part strikes the camera, the sensitive materials measure the intensity of light and convert the light rays into a range of numbers.
当一个物体上的光，如机器零件，照射到相机上时，敏感材料就可测量出光的强度，把光线转换为一组数字。
Focused light rays can set something afire.
聚焦的光线能把某些东西点燃。
The bending of the light rays is caused by refraction.
光线的弯曲是由折射造成的。
The bending of the light rays is caused by refraction .
光线的弯曲是由折射造成的。
In this case, light rays are focused on a point behind the retina.
在这种情况下，光线集中于在视网膜之后的点。
What they are in fact seeing is the light rays that have not been deflected.
他们事实上看到的是没有发生偏离的光线。
And as you get off center, those light rays won't be focused to the center of the eye.
呈像偏离晶状体中心后，光线就不会集中到眼睛中心。
To cause (light rays, for example) to converge on or toward a central point; concentrate.
使集中，使聚合使(如光线)集中在一中心点或向中心点集中；集中。
When the lens becomes cloudy, light rays cannot pass through it easily, and vision is blurred.
当晶状体变得“混浊”之后，光线就不能轻易的通过晶状体了，视觉就变得模糊了。
Two kinds of convex lens which make parallel light rays converge to the focal point are given.
本文给出两种能使平行光严格聚焦于一点的凸透镜。
The atmospheric bending of light rays is greatest when the sun is right along the horizon, at sunrise or sunset.
当太阳正好在地平线上的时候，也就是日出和日落的时刻，大气对光线的折射作用的最强的。
Diffraction: When light rays pass close to opaque surfaces, such as the blades of a lens diaphragm , they are scattered;
衍射：当光束靠近经过不透明表面，如镜头光圈的叶片时，它会散开。
Therefore, light rays emitted by the luminous source of the handheld electronic device can be uniformly transmitted from the keys.
由此，该手持电子装置的发光源所发出的光线能够均匀地从按键透射出。
As the disease continues to advance, the light rays entering the eye become significantly distorted, called irregular astigmatism.
随着疾病的进展，光线进入眼中发生扭曲，也就是不规则散光。
The lens focuses light rays on the retina - the layer of light-sensing cells lining the back of the eye - to produce a sharp image.
晶状体将光线聚焦于视网膜(排列在眼底的一层光敏细胞)来产生清晰的视觉影像。
I received a lot of feedback and emails from people after Posting the "Honduras Illustration part 2" asking for a tutorial on adding light rays.
在发布了“洪都拉斯渲染图第二部分”后，我收到了人们许多反馈和邮件，要求我制作一个添加太阳光线的教程。
Full cutoff means that no light rays from the lamp go above the horizon and that at least 90 percent of the light is blocked from going sideways.
“完全阻隔”是指电灯光线的照射不高出地平线，而且至少可以阻挡百分之九十的光线向旁边照射。
The electromagnetic energy employed to carry the data can be in the form of electric impulses or radiated energy in the form of either radio waves or light rays.
用来传送数据的电磁能量可以是电子脉冲，也可以是无线电波或光线之类的辐射能量。
Acting over long sight-lines to the rising and setting Sun or Moon, the refraction significantly alters the path of light rays creating merged, distorted images.
当太阳、月亮东升或西落时，这种效应沿长长视线的方向累积，造成部份光线传播方向出现较大幅度的改变，最后叠出这种扭曲的影像。
They look out into the sky, into the stars, and see a slight variance in light rays that come over the vastness of space, and assume a straight path, or nearly straight.
他们抬头仰望，看向群星，发现从广阔的宇宙射来的光线变化轻微，并假定光沿直线传播，或这近乎直线。
Gravitational lensing takes advantage of the fact that large celestial objects such as stars or planets warp the fabric of space-time such that light rays passing nearby are bent.
引力透镜利用这样的一个现象：巨大的天体会扭曲它附近的时空组成物。比如，当光线经过恒星或行星附近时会发生弯曲。
Gravitational lensing takes advantage of the fact that large celestial objects such as stars or planets warp the fabric of space-time such that light rays passing nearby are bent.
引力透镜利用这样的一个现象：巨大的天体会扭曲它附近的时空组成物。比如，当光线经过恒星或行星附近时会发生弯曲。
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