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What to do if…
you develop sudden double vision or have trouble focusing your eyes

Produced and maintained by PanicStation.org Published: Last reviewed: Editorial policy UK guide

Short answer

If double vision or trouble focusing started suddenly, get urgent medical help today by calling 111, using the NHS urgent help route for where you are, or asking for an urgent GP appointment. Call 999 now if it follows a head injury, comes with a severe headache or one enlarged pupil, or you have any signs of stroke or TIA.

Do not do these things

  • Do not drive, cycle, use power tools, cook on high heat, or do anything where mis-seeing could cause injury.
  • Do not walk around to test whether it settles, especially on stairs or uneven ground.
  • Do not take extra doses of medicines, alcohol, or drugs to try to calm it down.
  • Do not cover one eye and then drive; covering one eye can help you move safely for a short time, but it is not a driving fix.
  • If swallowing feels difficult, do not eat or drink until you have been assessed or told it is safe.

What to do now

  1. Sit down somewhere safe. Keep the lighting steady, put hot drinks and sharp objects out of reach, and ask someone to stay nearby if you feel unsteady.

  2. Call 999 now if any emergency sign applies:

    • face drooping, one-sided weakness or numbness, speech trouble, confusion, sudden dizziness, vertigo, loss of balance, or trouble swallowing
    • sudden blurred vision, sudden double vision, or vision loss with any of the symptoms above
    • double vision with a severe headache
    • double vision with one pupil suddenly larger than the other
    • double vision after a head injury
    • symptoms that came and went but sounded like a stroke or TIA

  3. If it started suddenly and none of the emergency signs above apply, call 111, use the NHS urgent help route for where you are, or ask for an urgent GP appointment today. Say clearly: “sudden onset double vision” or “sudden trouble focusing my eyes.”

  4. Reduce the immediate fall risk while you wait for advice. If you need to move a short distance, cover one eye with your hand or a loose eye cover, move slowly, and use a handrail or another person for support.

  5. Check what changes when one eye is covered, but do not try to diagnose it yourself. Tell the clinician or call handler whether the double vision goes away when either eye is covered.

  6. Write down the facts you may be asked for:

    • the exact time it started, or the last time your vision was normal
    • whether it is constant or comes and goes
    • whether you have eye pain, headache, scalp tenderness, jaw pain when chewing or talking, fever, neck pain, dizziness, weakness, numbness, confusion, or swallowing trouble
    • whether you have had a recent head injury, fall, infection, new medicine, or blood thinner

  7. Treat new severe headache, scalp tenderness, jaw pain when chewing or talking, or any new visual symptom as urgent. Ask for an urgent GP appointment or use 111 today, or call 999 if you feel very unwell or symptoms are rapidly worsening.

What can wait

  • You do not need to work out the cause right now.
  • You do not need to book a routine optician appointment first if this was sudden; start with urgent medical triage.
  • You do not need to make long-term driving or licensing decisions in this moment. Do not drive now. If double vision is diagnosed, a clinician or the official driving guidance can help with any reporting steps that apply to you.
  • You do not need to cancel the rest of your week, explain everything to everyone, or search through worst-case causes before you have been assessed.

Important reassurance

Sudden double vision is frightening and disorienting, but the right first move is simple: make yourself safe and get urgent advice. Many causes can be treated, and acting quickly helps protect you if the cause is time-sensitive.

Scope note

These are first steps only: immediate safety and getting you to the right urgent service. Diagnosis, treatment, follow-up, and driving decisions may need help from a clinician, eye specialist, or official licensing guidance later.

Important note

This is general information, not medical advice or a diagnosis. Sudden double vision or sudden trouble focusing can have many causes, including emergencies. If symptoms are sudden, worsening, or include neurological signs, call 999.

Additional Resources

Closely connected guides that may be useful during the same situation or its immediate aftermath.

About this guide

This guide was produced and is maintained by PanicStation.org using its published editorial process. Official and specialist sources are checked where relevant, and AI-assisted tools may be used for drafting, organisation, and consistency checks. The site operator remains responsible for publication, revision, and removal decisions.

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