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.
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。
Astigmatism occurs if the cornea is shaped like a rugby its curvature is not uniform. As a result horizontal lines are focused to a different point from vertical lines.
若角膜呈榄球形状，即其弧度呈不规则，水平光线将聚焦在和垂直光线不同的焦点，这便是散光。
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。
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