My double vision is monocular (but i have it in both eyes) because when i close EITHER eye the double vision does not go away. I would describe it more as a vertical "ghosting" effect. I have had this for about 3 years. When it first started, I became very worried so i went to the eye doctor and he changed my prescription which i thought would resolve it, but it didn't. I have just dealt with it for about 3 years now but i have health anxiety and sometimes when i think about that i never found the cause of it i get scared and freak out because what if it is a brain tumor or something, i always think the worst. even though idk how i'd have a brain tumor for 3 years and not know it and not have headaches or anything. anyway, the double vision goes away with the pinhole test which everyone says means that its a refractive error. It is most noticeable at night or in dim lighting.
I have one other symptom that i can literally find nothing on the internet about. When i look at an object up and down very quickly, it like smears downwards. I don't know how to describe it... but it happens when (like i said) i look at something up and down fastly and then i can see it like trail downwards for a second. Idk if that made any sense but let me know if you've ever had this or know what it's called.