Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Seek emergency medical help if a visual-memory problem begins suddenly, especially with:
Facial drooping, arm weakness, or speech difficulty
Sudden loss of vision or part of the visual field
Severe new confusion
A seizure or loss of consciousness
A sudden, severe headache
Symptoms following a significant head injury
These features may indicate stroke, bleeding, seizure, or another condition needing immediate assessment.
Note when the symptoms started if you can.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Does any of this apply?
Book an appointment
Arrange a routine medical assessment if visual forgetfulness persists, is getting worse, interferes with navigation or daily tasks, or is clearly different from your usual memory.
Gradual symptoms are not usually an emergency, but they still deserve evaluation.
If you already have a diagnosis, request earlier follow-up when your abilities change noticeably, existing strategies stop working, or safety becomes a concern.
Every sign above is quoted from the sofidex article on Monomodal visual amnesia. If you are not sure, err upward — it is always reasonable to be checked.