内弹性膜随胎龄增厚、增长、弯曲，有一系列形态变化。
The internal elastic membrane changed progressively with fetal development.
结论本年龄段内(19 ~ 40 a)前囊膜弹性与撕开口直径呈直线正相关。
Conclusion a Highly significant linear correlation was found between the anterior capsular elasticity and the opening diameter in youth (age range: 19 ~ 40 years).
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