They'll work just like the shield does. Just apply a little pressure to them.

[He can't even fend off a grin, because he's just so happy that Jude likes them. These sorts of projects are pretty intuitive for 9S, and with ample supplies at hand, he's been all too eager to innovate while he can.

Besides, he wanted to make something that Jude would be comfortable wearing just like he and 2B do with their own goggles]

I wasn't sure if they'd be to your tastes, but I think they're more convenient.