The Energetic Synthesis of Monocular 3D Space: Spot Density, Lateral Cancellation, and the True Mechanics of Diplopia

Classical optical neuroscience models monocular depth perception as a geometric calculation based on the radius of blur circles. This paper introduces a paradigm shift: the visual cortex calculates 3D space not geometrically, but *energetically*. We propose that the human brain establishes an absolute focal baseline ($Z$-anchor) via a thermodynamic search by the ciliary muscle. By analyzing the physical collision between transverse magnification shrinkage and micro-blur expansion, we prove that the eye intentionally maximizes photon spot density per retinal pixel. Under this energetic model, spatial mapping, monocular diplopia (double vision), and defocus (blur) are determined exclusively at the "lines of separation" on the retina. We demonstrate that flawless visual clarity is a biological hallucination; raw optical projection is permanently blurred by lens aberrations. Perfect clarity is artificially synthesized via Lateral Cancellation, a biological software filter that operates strictly when blur radius and geometric separation exceed the spatial capacity of a single retinal pixel. We conclude that 3D spatial mapping and visual clarity are natively monocular, energetic processes, generated by a continuous algorithmic suppression of physical optical errors.