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