Pinterest brings Lens feature to all users in the United States
The developers announced that the beta version of Pinterest Lens had been enabled for everyone in the U.S., on iPhone and Android, so if you're still using the social service, then you should update to the latest version.
For example, users can now use photos in the Gallery to do a search. Furthermore, Pinterest users can swipe up to find new Lenses that can check out, from turntables to travel ideas.
Keep in mind that since Lens is still in beta, it might not recognize all the objects you throw at it. Still, the feature is learning and it will remain in beta until it gets better enough to recognize all the things.
source: Pinterest
Things that are NOT allowed: