I heard a similar thing. But a bit more complicated. It wouldn’t be just the eyes, but all senses used by the brain to edit a filtered vision of reality.

And while the eyes take in everything they’re capable of, the brain only focuses on what it considers important. Which is probably false due to the many, many times one will search for something within their cone of vision, yet are unable to see it.

So while I’m not sure of the details, the brain can be thought of as choosy with what it shows.