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Sight after nasopharyngeal cancer treatment

Some people with nasopharyngeal cancer have problems with sight (vision). Problems might include double vision or rarely, sight loss in one eye. These changes can be difficult to cope with.

Who might be affected?

Only some people with nasopharyngeal cancer have problems with sight (vision).

The more advanced the cancer, the more likely it is to affect your sight. Unless you were diagnosed in the early stages of nasopharyngeal cancer, it might already have spread to:

  • the nerve that controls eye movement
  • the eye
  • tissue surrounding the eye

Double vision

Cancer affecting the cranial nerve that controls eye movement can cause double vision. But this only affects around 10 in every 100 people diagnosed with nasopharyngeal cancer (around 10%).

This often improves after treatment with radiotherapy and chemotherapy. There may be treatments your doctor can suggest to improve your vision if symptoms continue. It may be possible to correct it with glasses.

Other changes

You might have other changes in your vision if your cancer is affecting your eye socket. Or you might completely lose the sight in one eye. But this is rare.


Any change to your sight can be difficult to cope with. You can read more about coping with changes to your sight in our section about nasal and paranasal sinus cancer. Remember that not all the information there will apply to you.

Cancer Research UK nurses

For support and information, you can call the Cancer Research UK information nurses on freephone 0808 800 4040, from 9am to 5pm, Monday to Friday. They can give advice about who can help you and what kind of support is available.
Last reviewed: 
25 Feb 2021
Next review due: 
25 Feb 2024
  • Textbook of uncommon cancers (5th edition)
    D Raghavan, C Blanke, D Johnson and others
    Wiley-Blackwell, 2017

  • Nasopharyngeal carcinoma: United Kingdom National Multidisciplinary Guidelines

    R Simo and others
    The Journal of Laryngology and Otology, 2016. Volume 130, Supplement 2, Pages 97-103

  • Nasopharyngeal carcinoma: ESMO-EURACAN Clinical Practice Guidelines for diagnosis, treatment and follow-up

    P Bossi and others

    Annals of Oncology, 2020