You can't use "small details" to logically arrive a higher focus point. What use would humans have for intense detail, at a time when the world was far more dan

You can't use "small details" to logically arrive a higher focus point. What use would humans have for intense detail, at a time when the world was far more dangerous at range? And even then, 3,000 years ago is less than a blink of an eye in terms of evolution. Without more examples of humans actually "needing" intense, closer focus, there's no way (even with a 3,000 year evolution window) they'd evolve closer focus just for... art. Occam's razor is rather applicable here. Magnification would be way easier and more available. Even a polished bent sword magnifies.