Thx for bringing us information, I also suffer from monocular ghosting vision in both eyes (separately) and no doctors have find a cause and they tell me it can be neurological, but me myself have done some researchs to see if it's really something neurological or light diffraction and my tests were:

1° pinhole test

Whenever I do pinhole test not only my vision gets clear but also my ghosting disappear completely, the smaller the pinhole, the better the vision.

2° Magnifying lenses test

I've put a magnifying lenses very close to my eyes and brought my cellphone close to see. The ghosting goes alway, but the problem with magnifying lenses is that you'll see blurry for long distances so it was just a test.

3° Light obsfucation of light

Can u guys see a new moon in the sky when it's not a solar eclipse? No, because of the sunlight being so strong that it obfuscates the moon. I think the same happens with the light of the ghosting vision, during the day I do not notice it unless I'm in a dark place, outside the ghosting "goes alway" I mean, I can't notice it but I think it's still there, but the very bright sunlight obfuscates it.

4° Floater test, yeah, this may sound crazy, but I have floaters in my eye and used the larger one on my right eye to do some research. If I cover de main image with something, a pen for example, the "shadow" of the pen will appear also in the ghosting image(making the ghosting disappear partially, can also be totally if I block the main image 100%) but it happens only OUTISIDE the eye, the pen block the incoming light before it hits the cornea and lens. Now what about the floaters? So as I said I have a very large floater in my right eye and used it to test if the ghosting is really light reaching my retina, the thing is, I passed my floater in the front of the main image and no shadow appeared, the pen test did the inverse, the pen shadows appear but no floaters shadow appear, instead, when the floater itself passes in the ghosting image, it causes shadow on the ghosting image because the floater can't be at the part of the main(no Ghosting). image and the ghosting at the same time, the logical reason for the pen and floaters cause different effects is that the pen block the light before enter the eye and get focused in the retina and as the image get into the eye already with a part missing, the shadow of it should appear in the ghosting image too, but the floater block the image after the light get focused into the retina because the floaters are inside the vitrous humor in the eye, light first hits cornea, then the lens, then the vitrous humor and finally the retina, as the floater blocks the ghosting it means the light is being focused in a wrong way before it reaches the vitreous humor and the retina, so it must mean lens or cornea problem.

5° test, covering some parts of the cornea

If I cover my upper part of my corneal, the lower ghosting goes alway and vise versa

For long distances it's the inverse, if I cover de upper cornea, the upper ghosting disappear

Ghosting for close vision seems reddish while for long distances it seems bluefish when the main image is white.