Screening has been recommended because vision could be improved by encouraging treatment in the majority of older people with impaired vision.
建议对大部分的老年人进行视力不全的筛检，因为视力可以经由鼓励接受治疗而获得改善。
2
The absence of such evidence cannot be taken to mean that visionscreening is not beneficial; simply that this intervention has not yet been tested in robust trials.
因为实证资料不足，无法断定视力筛检计划没有利益，即该项介入措施尚未经过严谨的研究试验。
3
To assess the effects on vision of mass screening of older people for visual impairment.