It has been announced on October 25 by Google that it is rolling out the Google Lens button within Google Image search results. Google Lens, which was introduced in May 2017, is a visual search tool to help people learn more about images and what they are visually looking at.
With this tool, users can learn more about the images they clicked on within Google Image search. Google said “Starting today, when you see something in an image that you want to know more about, like a landmark in a travel photo or wallpaper in a stylish room, you can use Lens to explore within the image.”
Here is a GIF of it in action within image search:
After viewing an image, you should be able to see an icon square Google Lens icon in the image (see the above GIF). I haven’t been able to see it yet myself, so it probably isn’t fully rolled out as of this writing. Google said “Lens in Images is now live on the mobile web for people in the U.S. searching in English, and will soon be rolled out to other countries, languages and Google Images locations.”
It doesn’t seem that SEOS have to do anything in particular to take advantage of ranking better for Google Lens. This is simply a new feature that was added to Google Image search.