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Okay, a woman with multiple personalities, she had cortical blindness. So in some of her personalities, she's blind. She says she can't smell, but in some other personalities which they have been in, she is blind. She says she can see everything. This is actually true. And she can switch between completely blind and being able to see again within seconds. It has been tested. Her reflex has been tested, which she says that she's blind. There are small spots. Even her pupil is not responding to light. But in the other personality, which she can switch within seconds, there is people reacting to it. And she says she can see everything. Is this scientifically valid?

Short answer: yes, this is scientifically plausible, but rare, and the interpretation depends on diagnosis.
What you described matches reports from dissociative identity disorder (DID), historically “multiple personalities,” where some identity states can show striking state-dependent neurological changes, including vision loss, blindness-like exam findings, anosmia, paralysis, or analgesia. In modern terms, this is usually considered within functional neurological symptom disorder (FND)/dissociative mechanisms, not structural brain damage.
What can be true in such cases:
  • Rapid switching (seconds to minutes) between severe visual impairment and near-normal vision
  • Objective changes on exam across states (for example, variable visual field testing, different reflex patterns)
  • Symptoms that are involuntary (not “faking” in the simple sense)
Important caveat:
  • “Cortical blindness” strictly means damage to occipital cortex (structural neurological lesion). That kind of blindness does not typically switch on/off within seconds between identities.
  • If vision switches that fast, clinicians would more likely suspect functional/dissociative visual loss rather than fixed cortical blindness from injury.
About pupil responses:
  • In classic cortical blindness, pupils are usually preserved because pupillary light reflex pathways are mostly subcortical.
  • If pupils become nonreactive in one state and reactive in another, that is unusual and requires careful re-checking (technique, lighting, medications, autonomic effects, examiner variability). It can happen in complex functional/dissociative presentations, but it is not a classic cortical blindness pattern.
So is it “scientifically valid”?
  • Yes, as a documented clinical phenomenon of state-dependent functional/dissociative symptoms, with some objective correlates.
  • No, if claimed as literal structural cortical damage that reverses instantly with personality switch.
Best framing: This is likely a disorder of brain network function and top-down modulation (attention, perception, autonomic control, self-state), not tissue damage appearing/disappearing. It is real to the patient and can produce measurable findings, but the mechanism is functional/dissociative rather than destructive neurological lesion.
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