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。
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。
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。
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。
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