bifocal
adjective uk/ˌbaɪˈfəʊ.kəl/ us/ˌbaɪˈfoʊ.kəl/
（透镜）双焦点的
used to refer to lenses that are divided into two parts. The upper half is for looking at things that are far away and the lower half is for reading or for looking at things that are near.
Bifocal contact lenses have now been developed. 现在已开发出双焦点的隐形眼镜。
bifocal lenses 双焦点镜头
See: bifocals
- More examples
- Franklin invented the bifocal lens in 1760.
- He wore these big bifocal glasses.
- I need some bifocal sunglasses.