varifocal

/ ˈvɛərɪˌfəʊkəl /

adjective

1. optics having a focus that can vary
2. relating to a lens that is graduated to permit any length of vision between near and distant

Example Sentences

Neither of you feel any kind of heart-melting sexual attraction, but you’re both in a room together, it’s Thursday, there’s nothing on telly, and it seems very unlikely this man will try to murder you, because you’ve just spent 10 minutes talking about how useful his varifocal glasses are.

From The Guardian

For instance, the leading varifocal lens brand, Varilux, is made by Essilor.

From BBC