Double vision


Double vision (diplothia) is not usually serious but it's important to get it checked, even if it comes and goes.

Check if you have double vision

Double vision is when you look at 1 object but can see 2 images.  It may affect 1 eye or both eyes.

Signs that your child may have problems with their vision include:

  • narrowing or squinting their eyes to try and see better
  • covering 1 eye with their hand
  • turning their head in usual ways (for example, tilting their head)
  • looking at you sideways instead of facing forward

See an optician or GP if:

You think you or your child might have double vision.


Find an optician


Get advice from 111 now if:

  • you have eye pain and double vision
  • you have a severe headache with blurred or double vision

111 will tell you what to do. They can arrange a phone call from a nurse or doctor if you need one.

What happens at your appointment

An optician or GP can ask about your symptoms and do some simple, painless eye tests.  They may refer you to an eye specialist in hospital for tests and treatment.

The optician can also let you know if you need to see a GP instead.

Treating double vision

Your eyecare team or GP can advise you about the best treatment for double vision once they work out the cause.

In some cases, this may be simple treatments such as eye exercises, wearing an eye patch or being prescribed glasses or contact lenses.

Some conditions that cause double vision may require eye surgery to correct the problem.

Causes of double vision

Double vision has many possible causes, depending on whether 1 eye or both eyes are affected.

Try covering 1 eye at a time to see if your double vision goes away. 

If you still have double vision in one eye with the other one covered, it's probably only affecting that eye.

Double vision affecting both eyes (binocular)

Double vision affecting both eyes is usually a symptom of a squint.

This is where problems with the eye muscles or nerves cause the eyes to look in slightly different directions.

Squints are more common in children but they do not always cause double vision. An untreated squint in children under 7 causes a lazy eye instead.

Squints in adults are sometimes a sign of a more serious condition.

Double vision affecting 1 eye (monocular)

Double vision affecting 1 eye is less common. It's usually caused by eye problems such as:

  • dry eyes – where the eyes do not produce enough tears
  • astigmatism – a common condition where part of the eye is not a perfect shape
  • cataracts – cloudy patches over the front of the eyes
  • keratoconus – where the clear outer layer of the eye (cornea) gets thinner and changes shape


You must tell the Driver and Vehicle Licensing Agency (DVLA) if you're diagnosed with double vision as it could affect your ability to drive.

Find out how to tell the DVLA about double vision (diplopia).

The information on this page has been adapted by NHS Wales from original content supplied by NHS UK NHS website
Last Updated: 24/05/2022 14:12:02