On this page
How it can feel
- Vision that comes and goes without a stable “broken glasses” pattern.
- Tunnel vision or grey-outs under overload.
- Painful sensitivity to bright light or flicker.
- Reading and screens become high-cost tasks.
Day to day
- Work, study and driving fitness may be affected — follow clinical and legal advice.
- Supermarkets and fluorescent lighting can trigger shutdown.
- Fear of permanent blindness is common and deserves calm facts, not dismissal.
Understanding this FND symptom
Vision depends on eyes plus brain networks that filter and stabilise what you see. Functional disruption can alter visual experience even when the eye structure looks healthy.
What can help
- Proper ophthalmology / optometry assessment first where indicated.
- If functional, explanation plus graded visual activity.
- Screen hygiene, lighting changes, rest breaks.
- Treating migraine, dizziness and sensory overload companions.
This is information, not a treatment plan. Personal care decisions belong with you and your clinicians.
FAQs
Can functional visual symptoms improve?
Many people improve with the right explanation and rehab approach, but timelines vary. Avoid promises; aim for better function and less fear.
About this guide & further reading
Written and published by FND Connect. This is general information for people living with FND and those supporting them. It does not diagnose a symptom or replace advice from your clinician.
- Neurosymptoms: Visual symptoms
- North Bristol NHS Trust: functional neurological symptoms
- Neurosymptoms: when new or different symptoms need reassessment
External resources provide further reading; their inclusion does not mean their authors have reviewed or endorsed this FND Connect guide. Page updated 3 October 2026.
Take this to your next conversation
Note what happens, how it affects your day and what you want to ask. An appointment pack can help you organise that conversation.