复性散光是指两条垂直相交的子午线的光线，都不能聚焦于视网膜上。如果两条垂直子午线的光线的焦点都落在视网膜前面，但它们的程度不等，称为复性近视散光；反之，都落在视网膜后面且程度不等，称为复性远视散光。
结论：RK、PRK、LASIK术后视力低下的主要原因是医源性圆锥角膜和高度近视、高度散光。
Conclusions:Iatrogenic keratoconus, high myopia and high astigmatism are the major cause of vision lowering after RK, PRK LASIK.
圆锥角膜是一种先天性发育异常，是一种以角膜扩张为特征，致角膜中央部向前凸出、变薄呈圆锥并产生高度不规则散光的角膜病变。
Keratoconus is an uncommon autosomal recessive inheritance, characteristic of corneal ectasia, which results in the corneal central anterior bulging, conus formation and high irregular astigmatism.
结论L ASIK矫治高度复性近视散光安全、稳定、有效。
Conclusion The correction of high compound astigmatism with LASIK is safe, stable and effective.
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