对于实际光学系统，由于光的衍射和像差，使所成的点像为一弥散斑。
However, for the actual optical system, its point image become a speckle because of diffraction of light and aberration.
结论：在实际用眼中，由于调节反应诱发屈光力变化范围以及角膜的像差补偿作用，正视眼总能维持较高的视觉质量。
In fact, most of the time the moderate volume of accommodation response and the corneal compensation of inter eye wavefront make a stable and qualified vision quality possible.
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