Perspective is how the world presents itself to us, and has nothing to do with your eyeball.
Er, no, it has EVERYTHING to do with your eyeball. You know that a building in the distance is still the same height no matter how far away you are yes? It's only the image formed inside your eye that makes it appear smaller yes?
Perspective also happens to pinhole cameras which don't have lenses.
The purpose of a lens if to focus the light rays in to a single point. A pinhole camera doesn't need a lens: it IS the point. So yes, perspective happens with pinhole cameras. I still don't think you realise what perspective actually is... You can think of it as the angles formed by light in to the pin hole... there is still an "image" on the other side of the pinhole yes? So the further things move away, the smaller they appear in that image, because the angles between the top and the bottom and smaller... If the angles are smaller, then they project a smaller image... I'm really not sure what you don't understand about this
Things shrink in the distance because the world presents to us that they are shrunken. They are not physically shrunken, but the world presents to us that they are. It has nothing to do with the lenses in your eye to cause the effect.
What?? If it's not the eye, then what is it? I really can't comprehend how to even respond to this nonsense. It's as if you think there's some sort of "magic" involved which "presents" a small image to your eye? It's not... it's light inside your eye hitting different points on your retina.
You are basically arguing that a tiny voracious bear 3 miles in the distance isn't really displayed by the world to you as tiny. It is only your eyeball causing it to be tiny. That is a ridiculous notion on several fronts.
That's perspective! The bear isn't literally smaller... the eye isn't "causing" it to be small... the light rays from the top of the bear and the light rays from the bottom of the bear, are entering your eye so very very close to each other, that the image projected on to your retina is very small... Larger angle, larger image... smaller angle, smaller image. You do understand how "lines" work right?
Take this image, from Johannes Kepler's "Astronomiae Pars Optica", published 1604 (not sure if it's an image from the book or derived). As the object described by A-B moves further away, then the image a-b gets smaller yes? We've known how the eye and perspective works for 400 years.