WHO EMRO
  • Regions
WHO EMRO
WHO Regional websites
Africa Africa
Americas Americas
Asie du Sud-Est Asie du Sud-Est
Europe Europe
Méditerranée orientale Méditerranée orientale
Pacifique occidental Pacifique occidental
  • Home
  • Health topics
  • Health topics
  • Data and statistics
  • Media centre
  • Information resources
  • Countries
  • Programmes
  • About Us
Search Search

Search

- All words: Returns only documents that match all words.
- Any word: Returns documents that match any word.
- Exact Phrase: Returns only documents that match the exact phrase entered.
- Phrase Prefix: Works like the Exact Phrase mode, except that it allows for prefix matches on the last term in the text.
- Wildcard: Returns documents that match a wildcard expression.
- Fuzzy query: Returns documents that contain terms similar to the search term. For example: If you search for Kolumbia. It will return search results that contain Columbia or Colombia.
  • Global
  • Regions
    WHO Regional websites
    Africa Africa
    Americas Americas
    Asie du Sud-Est Asie du Sud-Est
    Europe Europe
    Méditerranée orientale Méditerranée orientale
    Pacifique occidental Pacifique occidental
Search Search

Search

- All words: Returns only documents that match all words.
- Any word: Returns documents that match any word.
- Exact Phrase: Returns only documents that match the exact phrase entered.
- Phrase Prefix: Works like the Exact Phrase mode, except that it allows for prefix matches on the last term in the text.
- Wildcard: Returns documents that match a wildcard expression.
- Fuzzy query: Returns documents that contain terms similar to the search term. For example: If you search for Kolumbia. It will return search results that contain Columbia or Colombia.

Select your language

  • اللغة العربية
  • Français
WHO EMRO WHO EMRO
  • Home
  • Health topics
    • All Topics »
    • A
    • B
    • C
    • D
    • E
    • F
    • G
    • H
    • I
    • J
    • K
    • L
    • M
    • N
    • O
    • P
    • Q
    • R
    • S
    • T
    • U
    • V
    • W
    • X
    • Y
    • Z
  • Health topics
  • Data and statistics
  • Media centre
  • Information resources
  • Countries
  • Programmes
  • About Us
  1. Cataract

Cataract

Image of an eye with cataractCataract is responsible for over 51% of blindness in the Eastern Mediterranean RegionWhat is cataract?

Cataract is a clouding of the lens in the eye that normally affects vision. Cataract, the most common cause of blindness and visual impairment, is often related to ageing. Occasionally children are born with the condition, or a cataract may develop following an eye injury, or as a result of inflammation or other diseases, such glaucoma and diabetes. Sometimes, the development of cataract is linked to steroid use or it may develop after exposure to some types of radiation.

Cataract is responsible for over 51% of blindness in the Eastern Mediterranean Region. Although cataract can be easily surgically operated , in many countries access to eye care is limited. As people in the world live longer, the number of people with cataract is anticipated to grow. Cataract is also an important cause of low vision.

There is no known prevention for the cataract. Reduction of cigarette smoking, ultraviolet light exposure may delay the development of cataract.

The WHO prevention of blindness programme provides technical support to Member States in the development of comprehensive eye care systems to address the burden of cataract.

Information resources

Recent publications

Community eye health journal

Policy documents

Action plan for the prevention of avoidable blindness and visual impairment: 2010 [pdf 1.30Mb]

Links

Prevention of blindness and visual impairment, WHO headquarters

Layton Rahmatulla Benevolent Trust

National Eye Institute

Related topics

Related programmes

Noncommunicable diseases

Violence, injury and disability

Collaborating centres

Al-Shifa Trust Eye Hospital, Pakistan

King Khaled Eye Specialist Hospital, Saudi Arabia

Iran Eye Research Center

  • Site map
    • Home
    • Data and statistics
    • Health Topics
    • Media centre
    • Information Resources
    • Countries
    • Programmes
    • About Us
  • Help and services
    • Careers
    • Copyright
    • Privacy
    • Contact us
  • WHO Offices
    • WHO Headquarters
    • WHO African Region
    • WHO Region of the Americas
    • WHO European Region
    • WHO South-East Asia Region
    • WHO Western Pacific Region
WHO EMRO

Privacy policy

© WHO 2025