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"Eye scans" makes me skeptical about this. The eye scanner like in Minority Report are still science fiction. When's the last time you went to an optometrist? They don't even have gear that can image your eye without shoving your face against the device. Even an image from a closer camera like a self checkout would only have the resolution to "scan" your eye in so far as a normal picture to get your eye color.

Actual retina imaging is like fingerprints where it's indexing marks, patterns, blood vessels, etc in your retina. There's no chance any camera on the planet has that fidelity to do that from further than mere inches away. And if you could do that, well you could also image fingerprints which are more pronounced, but notice there's no talk about that?

Also since like 80% of the world has brown eyes, without deliberately illuminating your eyes with a bright light (again, think optometrist) you'd at best just image a dark blob.

And I doubt a random grocery store has some hyper advanced technology that would cost millions when none of this is even necessary in the first place since you can just sniff for phones or even card RFIDs.