If it's elliptical, you can make an astigmatic lens.
假如是椭圆形，就可以用于制作散光镜片
Influences of an Astigmatic Lens on CoshGaussian Beams.
像散透镜对双曲余弦高斯光束的影响
Design of Astigmatic Lens with Compensating Optical Aberration
带像差补偿的光盘像散自动调焦透镜设计
Propagation Properties of Partially Coherent Light Passing Through an Aperture Astigmatic Lens
部分相干光通过光阑像散透镜的传输特性
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