I also cannot recollect visual things in mind eye. It is strange to explain but I am good with inventing things and imagining complex things but I cannot see anything in mind eye. It is not visual it is more as abstract "shape", shape is not good word as it is visual, in my case try to imagine shape more as intuition or feeling. I do not know how to explain.

I was kind of annoyed by this finding that I started trying different ways to imagine objects. Few months ago interesting thing happen, I woke up really early and stayed up after 2am, when I got in bad, I was in state that I passed state of sleepy, so my mind was fully conscious, (state you can choose do you want to get up or not at any time), and then stream of images appeared from single point, that point grew and like accessing some optic cable hole, and it was vivid very vivid like reality. It lasted just a few 10 - 30 sec before I was knocked of and started sleeping.

It look like my left side of brain (logic) was so tired that handed over everything to right side (pictures colors) additionally leaving spectator (chartering voice) awake for little while. I am no medical person just interpreting subjective experience so do not take any of this as fact. I just remember that at at that point that I had feeling that Logical side of brain imposed some kind of dictatorship on imaginative side of brain, because of job or past experiences. That time logical brain was too tired after more than 20hrs of coding and thinking so it seems went away for a sleep fraction of time earlier than the imaginative side. :)