Important note: This post is a discussion of one of the claims (claim in title) made in my book The Human Holographic Visual System.  To learn more of how the retina and other components of the visual system function, read my book.  It is available in hardback, paperback, and e-book formats at Amazon, Barnes and Noble, and Bookshop.   

When light waves enter the retinas, they encounter different layers of the retina.  The second layer they encounter is the Retinal Nerve Fiber Layer (RNFL) and this layer has axons that are layered perpendicular to the flow of the light waves.  The axons are extremely tiny and are packed closely together but are spaced enough to create nanoscale grooves and slits.  Because there are millions of axons, there are millions of the nanoscale slits and grooves which act as diffraction gratings.  The diffraction gratings facilitate the process of angular dispersion which causes the separation of visible light into its component wavelengths.  This is what produces fully coherent light waves.    

      Also, the process of angular dispersion causes light waves to spread out which eventually causes the light waves to interfere with each other, creating constructive interference and destructive interference.  It is the mixture of constructive interference and destructive interference that produces fully coherent interference patterns for each separated wavelength the retina produces.  

      So, the retinas produce fully coherent interference patterns for the red wavelength, the green wavelength, and the blue wavelength for the cone photoreceptors.  Also, the retinas produce fully coherent interference patterns for the neutral-color wavelength for the rod photoreceptors.    

      Following the light waves as they go through the different layers, the light waves go through four more layers of the retina before striking the photoreceptors where they exist in the Photoreceptor Layer (PL).  The fully coherent object light waves of the interference patterns are captured by the photoreceptors in this layer.  

• The coherent red light waves are captured by the red cone photoreceptors.  
• The coherent green light waves are captured by the green cone photoreceptors.  
• The coherent blue light waves are captured by the blue cone photoreceptors.  
• The coherent neutral-color light waves are captured by the neutral-color rod photoreceptors.     

The fully coherent object light waves of the interference patterns are the object light source for the visual system.  

An object light source and a reference light source are required for a holographic system to function.  

To learn more, read my book The Human Holographic Visual System.  The book is available in hardcover, paperback, and e-book formats at Amazon, Barnes and Nobles, and Bookshop.