The best focal point is determined by the spherical aberration coefficient, and .

球差系数决定了最佳聚焦点的位置。

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Maintaining smaller vertical primary coma and correcting spherical aberration completely for myopia and myopic astigmatism may be the best choice for customized cornea laser ablation surgery.

对欲行个体化角膜切削的近视及近视散光患者，保留较小的垂直彗差而完全矫正球差可能有助于视觉质量的提高。

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At one extreme, hardliners believe the European project is a historic aberration and believe the U.K.'s best interest lies in the collapse of the euro and Britain's withdrawal from the E.

WSJ: Cameron Main Threat to Britain In Europe