First unveiled last year at the Google I/O 2017 conference, Google Lens uses the company's image recognition and machine learning algorithms to identify the subjects of photos and videos and present additional helpful actions and information to the user.
For example, if you take a picture of a business card, Google Lens will offer to save the phone number or address to one of your contacts. Similarly, taking a photo of a book, landmark, building, painting, plant or animal can throw up an option to view more details about the picture's subject.
A few things to note: Currently Google Lens only works if your device's language is set to English, and you're running the latest version (3.15) of Google Photos. You can check what version you're running in the app's settings – tap the cog icon and select "About Google Photos" in the menu. Also note that your Google Lens activity is saved to your Google Account if you have Web & App Activity turned on.
Starting today and rolling out over the next week, those of you on iOS can try the preview of Google Lens to quickly take action from a photo or discover more about the world around you. Make sure you have the latest version (3.15) of the app.https://t.co/Ni6MwEh1bu pic.twitter.com/UyIkwAP3i9— Google Photos (@googlephotos) March 15, 2018
If you still don't see the Google Lens icon when viewing individual photos or videos, it's likely the feature hasn't reached your region yet. Google says the update is being released in batches and all devices should receive it soon.
Google Photos is a free download for iPhone and iPad available on the App Store. [Direct Link]