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.

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模型有较强的通用性，适用于传统仅矫正屈光不正(近视、远视、散光)的光学区模型，也适用于波前像差引导的激光眼屈光手术。

The model not only can be applied to the correction of refractive errors such as myopia and astigmatism, but also can be used in wavefront guided laser refractive surgery.

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本文用像差平衡的方法求出优化的全息分路器光路结构参量。

Optimized parameters of the optical configuration of holographic wavelength demultiplexer (HWD) have been obtained with aberration balancing.

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