I went through exactly what your going through right now, from my experience I think it's all in our heads because once I started obsessing about something else the unreal feeling disappeared
Thx for the replies... I might be overthinking. Because a few days ago i thought i had some other disease and now its deeralization.
No, it's not derealization. That's not a disease, it's a symptom of depression or anxiety and you're not reporting any of that. Did you get a headache after the vision problem? That would most likely make it a migraine. But your answer is never to go around Googling symptoms, but if it's lasting you should see your doctor or an ophthalmologist.