3D grating optics of human vision

Area of Science:

• Optics
• Biophysics
• Neuroscience

Background:

• The human retina's outer nuclear layer contains photoreceptor cell bodies.
• These cells are arranged in approximately 6-7 layers, exhibiting closest packing.
• Existing models of vision primarily focus on geometrical optics and neuronal processing.

Purpose of the Study:

• To propose a novel interpretation of photoreceptor cell structure and function.
• To elucidate the physical optics underlying early color vision.
• To explore the implications of a 3D grating model for visual perception.

Main Methods:

• Analysis of photoreceptor cell body arrangement as hexagonal multilayer 3D gratings.
• Application of Fresnel interference principles to light processing within these gratings.
• Mathematical modeling of light-grating interactions to derive color signals.

Main Results:

• Photoreceptor cell bodies act as 3D gratings, processing light through Fresnel interference.
• This optical process generates triplets of chromatic interference maxima at specific wavelengths (559/537/447 nm).
• The model explains the Purkinje shift and mathematically links color perception to light speed and 3D geometry.

Conclusions:

• Early color vision is based on 3D grating optics, not solely geometrical optics or neuronal networks.
• The photoreceptor's chemical programming (visual pigments) may be based on 3D grating optics.
• The eye acts as a trichromatic Fresnel-optical modulator, processing more visual information than relayed to the brain.