No worries. I think the issue here is that if you brought 10 people into a room and somehow knew that they had exactly the same perception as each other, and got them to look at this post, they'd all start placing themselves at every number along the scale. Again, despite having identical sensory experiences.
"I can visualize an apple"
"Really? You can just see an apple in your mind whenever you want?"
"Of course... you can't do that??"
"No, I mean I can imagine an apple, but my mind's eye doesn't SEE anything"
"wow so it's just... BLANK?"
At this point, the first person thinks they're talking to someone who rediscovers what an apple looks like every time it enters their field of view. The second person thinks they're talking to someone who can just project cartoons onto the back of their eyelids. But they are just making different assumptions about what "see" means - they're both taking each other more literally than they are taking themselves.
I'm pretty sure there are people with messed up visual memory as well as people who can hallucinate at will, but there are a ton more people misinterpreting each other who don't experience either of those things.