目的：完善胎儿眼球发育评价指标，为利用胎儿角膜移植提供基础数据。
AIM: to consummate the evaluating norm of fetal eyeball so as to offer basic data for fetal cornea transplantation.
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.
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