上网查了一下，好像就是 progressive bifocal lenses，无缝平滑过渡。

来源: 欲千北于 2015-05-26 20:39:13 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.