I have gone over umpteen times that light does not travel inward to affect vision
So, "
Light indeed has to travel inward" but the light which travels inwardly does not "affect vision". That would appear to mean that light does not participate in or contribute to the biological process which effects vision. The biological process which effects vision occurs entirely within the bodies of individual persons. Since, according to Lessans and you, light has no role in that corporeal biological process, it is impossible for light to "reveal" anything biologically, and that means light is not necessary for the biological vision process to occur. Of course, you insist that light is indeed necessary, but that is a
charade - "an empty or deceptive act or pretense".
That light is indeed necessary for sight is because light IS a
necessary condition. Your logic is so convoluted, it's hard to make sense out of it. Light does not travel inward, which only means that the pattern or wavelength does not travel to our eyes through spacetime and get transduced into an image, per the afferent account. That is all it means. Light is
necessary and plays an important role in sight, which he never denied, because without light, we would be in the dark.
He didn't say light was not afferent.
If his not saying "light was not afferent" means that light is afferent,
He did not say light was not afferent. He said the eyes were not afferent.
but if it is also the case that light does not participate in or contribute to the biological process which effects vision, then light afference, according to Lessans and you, is inert with regards to the biological process which results in vision,
It IS inert in that it doesn't play an active role, but is a vital link that connects our inner world to the outer world.
and that means light is not necessary for the biological vision process to occur. Of course, you insist that light is indeed necessary, but that is a charade - "an empty or deceptive act or pretense".
To the degree that light is our visual connection, it is 100% necessary for the biological vision process to occur because it allows the object and its reflection to be at our photoreceptors in real time, which the brain then uses to think, categorize, and integrate into a form that can be used to understand the world around us.
what we see is utilized by the brain to form concepts.
If light does not participate in or contribute to the biological process which effects our seeing, and if what we see contributes to concepts formation, then light does not contribute to concepts formation by means of our seeing.
Light DOES participate, but does not cause. It plays a a passive role. It is inert in the sense that it doesn't actively convert its wavelength/frequency to the object's wavelength/frequency upon striking the object. It keeps its own intrinsic wavelength/frequency before and after striking an object.
If light does not contribute to the biological process of seeing but light does contribute to concepts formation, then, since light is afferent and not inert, an issue which needs to be addressed is identification of that pathway by which light gets conveyed inwardly into the body for use by the brain. You have already said that "
light doesn't go through the optic nerve." Does the light utilized not at all in the biology of seeing but supposedly in the biology of concepts formation enter through the pores in the skin? Does it enter via the nostrils? Or maybe the ears? Maybe the tongue plays a role.
Preposterous?!?!?! Of course!
The data doesn't get chemically transduced through the optic nerve. That doesn't mean the optic nerve doesn't play an important part in vision. Please stop the sarcasm, thanking you in advance.
But this brings up a related issue: What is a
concept? It is a thought, certainly. It can be a thought abstracted from particular instances or experiences. For sure. But, with regards to what we see, if what we see is only the efferent projection of concepts, then why do we fail to see when there is not sufficient light?
What are you talking about, Michael? Your logic is getting more and more confusing because your premises are invalid. The brain uses what it sees, through the eyes, in real time (if he is right), the same way the brain would use what is reconstructed in delayed time. The exact mechanism is not as important (at this point) as whether the model itself is a workable alternative to the present model, which it is.
If vision is only efferent, if vision is only a matter of concepts being projected,
What do you mean by "if vision is only a matter of concepts being projected?"

You need to carefully reread what he wrote regarding the brain and its attributes to fully understand why he said that the brain acts like a movie projector.
then we should be able to see without need of light.
Where did you get the idea that we should be able to see without the need for light in the efferent account of vision?
We need light to see; therefore, vision is not exclusively efferent - contrary to Lessans and you. But if we need light so see, then vision is not to be identified as only the projection of concepts, and this further indicates that light must participate in the biological process which effects vision, even if the optic nerve does not in fact have any role in the afferent biology.
Vision is exclusively efferent. Your reasoning is not accurate, period. We need light to see, and light exists in this model of vision.
You're going to have to let go temporarily of your apparent belief that efferent vision is impossible
That is illogical. On several fronts - only one (okay, maybe two) of which will be addressed here: To hold that inwardly traveling light participates in or contributes to the biological process which effects vision is not the same thing as holding that "efferent vision is impossible".
True. Only holding that efferent vision is valid and sound can it be said that it is not the same thing as inwardly traveling light participating and contributing to the biological process of vision because they are opposites, which would be a contradiction.
It is Lessans and you who insist that efferent vision is necessarily incompatible with afferent vision. Your insistence is not evidentially or observationally supported, and your insistence is not even supported logically for which you would have to exclude the conceptual possibility of vision having both afferent and efferent aspects.
It is very much supported that these two models of sight --- afferent and efferent --- are defined in a way that makes them incompatible when it comes to rational thinking.
Since you hold that light does not biologically contribute to vision,
I am not letting you get away with this. Light contributes to vision. We cannot see anything without light, so you're providing a strawman.
it is you who provides the reason and basis for thinking that efferent vision is biologically impossible, because there is no purely conceptual basis for denying that vision has both afferent and efferent aspects - even if there are observational bases for doubting that vision is efferent.
Please provide reason for thinking that it is impossible for vision to have both afferent and efferent aspects.
This claim is only in reference to how the brain and eyes work in unison. In regard to his claim, it can't be both afferent and efferent. It has to be one or the other. We see in delayed time, or we don't.