You probably wouldn't experience "exit blindness" in your astral body. By now it should be rather well-developed. If you can see in your dreams, "astral blindness" may not be what's occuring. Especially if you had lucid dreams in the past.
The third eye also is not so much about sight, but about coordinating your inner sense impressions from all chakras into a coherent mind picture. I believe for example that I had an experience pertaining to this where the 1st, 2nd, 3rd and 6th chakra were active - I could not see, but I had a sort of "touch vision." I knew how far things were away from me (impression of having a body, 1st chakra), where they were in space (2nd chakra - awareness of space) and I could move (3rd chakra). All that information compiled together (6th chakra) gave me a coherent picture of my surroundings, just not one like I would have expected it.
As for "exit blindness" - the "lights went on" for me around the time the 4th chakra would have come on in the energy body where I was aware of this developmental process unfolding. The heart chakra is about function, and that's why I think it has a lot to do with sight. Knowing what a thing or energy is is part of translating it into a picture. Before that I knew I moved, a relation to other things around me, but I did not know what these things were (their function) and could therefore not render them into images in my mind. (Imagine a world where you could not see a table if you did not understand what a table is...)
Knowing the function of an entity or thing means knowing its purpose. What is it for? What can it do? How does it relate to myself? How does it relate to other things? These impressions started to happen. I would find sign posts regarding my whereabouts and could read them (at least I thought I've read them - maybe I just knew what was on them and did not question that). The pictures my mind would render of places I could bring back and interpret to get a clearer understanding of where I had been. The important thing is that this translation process picks your brain for the closest physical thing to approximate the nonphysical experience. This process gets more accurate over time. It yields more information and gets closer to the energetic truth behind the picture. The picture is just for your own understanding - and also shows the limits of that understanding. How the world looks like in an AC is a reflection of what's in your mind and on your mind and what you know. It's as much a glance without as within.
Regarding the neck - all chakras are interconnected. A blockage in one might limit their overall interaction. Just a thought.
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