At present there are no robust trials available that allow the benefits of school vision screening to be measured.

目前没有强而有力的试验可以测量学校视力筛检的好处。

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There is, therefore, clearly a need for well-planned randomised controlled trials to be undertaken in various settings so that the potential benefits and harms of vision screening can be measured.

因此，很明显地需要在各种机构执行规划良好的随机对照试验，以测量视力筛检可能的好处与害处。

youdao

There is, therefore, clearly a need for well-planned randomised controlled trials to be undertaken in various settings so that the potential benefits and harms of vision screening can be measured.

因此，很明显地需要在各种机构执行规划良好的随机对照试验，以测量视力筛检可能的好处与害处。

youdao