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.
散光有折射缺陷的透镜或其它光学系统,阻碍光线汇聚于一个焦点,形成一个模糊或不完全的图象。
A refractive defect of a lens or other optical system that prevents light rays from converging at a single point resulting in a blurred or imperfect image.
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.
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