Is this double vision, monovision or both?

Factual Questions
1

Obviously I need to talk with a doctor about this, but for now I’d like a general idea about it.

Imagine the eye periphery of a person, left eye covers the left part and the center part in front of the person and the right eye covers the right part and the center. Both eye’s peripheries overlap in the middle, so in a average person the center parts should be received by the brain as one image and there should be a depth sense. In my case the left eye covers the left periphery part, the right covers the right periphery part, but only one eye can cover the middle part, and I can choose which one it will be. So for example if I put a finger in front of my face, I can see what’s happening right or left from me like everyone else, but I can focus on the finger in front of me with either my right eye or my left eye, but not with both of them and I don’t have any depth sense. The brain simply totally ignores the image from one eye, be it left or right.

If I try really hard to focus with both eyes on one point, I get like one millisecond of a image from one eye, then another millisecond of the image from the other eye, but I can’t really get the brain to take both images at the same time, even though they are physically both looking at the same object.

So what is this, double vision, monovision, amblyopia or something else?

2

I think what you’re talking about is ocular dominance. Some people can switch their dominant eye from left to right.

3

Sounds like my eyes, and in addition to garden-variety nearsightedness and the beginnings of presbyopia, I’m stereoblind.

4

Actually the way things work is that the right half of each eye sees the left side and the left half of each eye sees the right side. At the optic chiasm the nerves split between the right and left brain such that the right brain sees the left side and the left brain the right side. It makes evaluating partial blindness very complicated.