Visual Disturbances After Traumatic Experiences in Teens - Neurology

After seeing or thinking about bloody and nauseating images, the visual field becomes narrowed?

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Hello Doctor, my son is 19 years old.
Since he was about 11, he has experienced episodes where his vision narrows after seeing graphic images (such as corpses or dissection scenes), but not with other types of graphic content like feces or gun violence.
During these episodes, his peripheral vision becomes dim, and he can only see a small central area clearly (for example, in a car, he can only see the size of the license plate in front of him).
He also feels dizzy and sweats, and these symptoms last for about 10 to 30 minutes before returning to normal.
This has occurred about once or twice a year since he was 11.
Last year, we visited an ophthalmologist at a medical center, who used office equipment to examine his eyes and found no issues.
He has also seen psychiatrists and other eye specialists, but none could provide an explanation.
Recently, I recalled that when he was 11, he fell while playing dodgeball at school one morning, landing on his buttocks and hitting the back of his head on the concrete floor.
That afternoon, the school informed me that he was not in good spirits and had blurry vision when looking closely.
We went to the emergency room, where the doctor conducted an initial assessment and decided not to rush into a CT scan, opting to observe him first.
After resting in the emergency room for nearly two hours, he was eating normally and his spirits improved, so the doctor prescribed headache medication and sent us home for observation.
In the following 5-6 days, he occasionally experienced tinnitus, but then returned to normal, and he gradually forgot about the fall.
I am unsure if the narrowing of his vision is related to this fall.
Note 1: He currently cannot recall whether the symptoms started before or after the fall.
Note 2: At the time, I did not intuitively connect it to the fall, as he only mentioned the narrowing of vision around the age of 13 or 14.
Note 3: I believe his cognitive function has not been affected by the fall; aside from the occasional narrowing of vision, he has had no other symptoms related to his brain, eyes, or elsewhere.
He is currently studying at National Changhua University of Education.
I would like to ask the doctor: 1) Based on your clinical experience, have you seen patients with similar symptoms? 2) Does this symptom seem more related to a brain issue or an eye issue? 3) Is it likely that this symptom was caused by the fall? 4) Nine years have passed, and my son tells me he has learned to control it well by closing his eyes when he anticipates seeing graphic images, so it has occurred very rarely in the last 2-3 years (I recall it happening only once, when he was too engrossed in a novel and "thought" of a graphic scene).
However, as a concerned parent, I would like to know if it is sufficient to avoid looking at or thinking about graphic images to prevent episodes.
5) If you recommend finding the cause, which specialty should my son see next? Does it need to be a large hospital with advanced brain imaging equipment? 6) From a medical standpoint, over the past nine years, has there been no damage to his eye function due to this condition? If left untreated, is there a significant risk that it could lead to damage in the future? I apologize for the many questions, and I appreciate your understanding.
Thank you, Doctor.

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Zhong, 50~59 year old female. Ask Date: 2022/07/12