varifocals
noun /ˈveərɪfəʊklz/
/ˈverɪfəʊklz/
[plural]- a pair of glasses in which each lens varies in how thick it is from the upper part to the lower part. The upper part is for looking at things at a distance, and the lower part is for looking at things that are close to you.
渐进多焦镜（镜片由上至下用于看远、近距离的东西）