What is the most common cause for Blindness worldwide?

Answer 1

Trachoma, an eye infection that is the leading preventable cause of blindness in the world. It is spread through contact with flies and other insects, clothing or household items that harbor the bacterium, or infected people. Trachoma occurs in poor, overcrowded communities that have little access to clean water, waste treatment facilities, or health care. These communities are located mainly in Africa, the Middle East, Asia, Australia and some areas of Latin America. The World Health Organization (WHO) previously endorsed a multi-faceted strategy to control trachoma, including surgery for trichiasis (This is a condition in which the eyelid turns inward and eyelashes rub against the eye, resulting in corneal scarring and loss of vision and results from trachoma) and application of tetracycline after surgery.
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Matador 89

Answer 2

Trachoma is the most common cause of blindness worldwide, mainly occurring in the tropics.
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Answer 3

Most visual impairment is caused by disease and malnutrition. According to WHO estimates in 2002, the most common causes of blindness around the world are:

-cataracts (47.8%),
-glaucoma (12.3%),
-uveitis (10.2%)
-age-related macular degeneration (AMD) (8.7%),
-trachoma (3.6%),
-corneal opacity (5.1%), and
-diabetic retinopathy (4.8%), among other causes.

People in developing countries are significantly more likely to experience visual impairment as a consequence of treatable or preventable conditions than are their counterparts in the developed world. While vision impairment is most common in people over age 60 across all regions, children in poorer communities are more likely to be affected by blinding diseases than are their more affluent peers.

The link between poverty and treatable visual impairment is most obvious when conducting regional comparisons of cause. Most adult visual impairment in North America and Western Europe is related to age-related macular degeneration and diabetic retinopathy. While both of these conditions are subject to treatment, neither can be cured.

In developing countries, wherein people have shorter life expectancies, cataracts and water-borne parasites—both of which can be treated effectively—are most often the culprits (see River blindness, for example). Of the estimated 40 million blind people located around the world, 70–80% can have some or all of their sight restored through treatment.

In developed countries where parasitic diseases are less common and cataract surgery is more available, age-related macular degeneration, glaucoma, and diabetic retinopathy are usually the leading causes of blindness[10].

Answer 4

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Answer 5

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Answer 6

World-wide, it is probably that parasite that causes blindness.
Millions of people in Africa are blinded by it each year.

Answer 7

There is a black woolly caterpillar in my area, NC, that has poisonous spines that will give you a stinging rash. I have never heard anything about "shooting venom". Maybe in Australia???