But so far, improvement in vision has persisted as long as two years after a single treatment without evidence of significant adverse side effects.

但到目前为止，在经过一次性治疗后，病人视觉的改善最长已经维持了两年时间，没有证据显示出现了明显的不良副作用。

youdao

(of an idea or opinion) formed beforehand; especially without evidence or through prejudice: certain preconceived notions.

(意见或观点)提前形成的；尤指没有依据或有偏见的：某一先入为主的意见。

youdao

Follow-up ranging from 2 to 5 years (mean, 38 months) showed improvement in hip function without evidence of prosthesis loosening.

随访2年至五年(平均38个月)显示髋关节功能改善且没有假体松动征象。

youdao

In a recent broadcast, al-Alam TV alleged, without any independent evidence, there had been a coup attempt in Saudi Arabia and that Prince Bandar, the son of Crown Prince Sultan, was under arrest.

VOA: standard.2009.11.16

Mr Press denounces Republicans for claiming, without evidence, that God is on their side.

ECONOMIST: The politics of Christmas

Prosecutors said there would not have been enough to convict him without evidence from his first interview.

BBC: Highlands & Islands

Because people are not used to say anything without evidence, they end up saying nothing at all.

FORBES: Should Business Schools Be Braver?