varifocal

Use bifocal or varifocal lenses may relieve asthenopia.

如改用双焦点或渐进多焦点镜片可能有助于减轻视疲劳.

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The paper introduced how to use aspherical lens in the design of varifocal beam expander system.

在激光系统中,伽里略球面透镜扩束器已得到广泛地应用,但是,它有许多不足之处.

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