Use bifocal or varifocal lenses may relieve asthenopia.
如改用雙焦點(diǎn)或漸進(jìn)多焦點(diǎn)鏡片可能有助于減輕視疲勞.
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The paper introduced how to use aspherical lens in the design of varifocal beam expander system.
在激光系統(tǒng)中,伽里略球面透鏡擴(kuò)束器已得到廣泛地應(yīng)用,但是,它有許多不足之處.
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