Practice have shown that this merite function can be used not only for the initial step of aberration balance, but also for the accurately correcting process, with the purpose to abtain the optimal aberrations balance.

• 实践证明,这种价值函数不但可用于象差平衡的开始阶段,更可用于象差的精细校正过程,以获得象差的最佳平衡方案。