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This has to do with optics. The further away an object is from the film/retina, the less photons are interacting with it. No surprise here. I'm not sure what you're getting at.
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Because in optics the cause of the reduction in the desnity of photons is due to
divergence while traveling from the object being reflected from to the sensor (retina or film)
Lessans stated that traveling photons are not a factor in efferent vision so why are you stating they are a factor?