This article does not have any sources. (September 2010)
In modern countries, few young people are blind. In all the world, blindness is mostly caused by malnutrition and diseases of old people, like cataracts and trachoma. People can become blind because of diseases or accidents, but sometimes people are born blind.
Some people are color blind, which means they can see, but cannot tell certain colors apart.
Other websites[change | change source]
|Wikimedia Commons has media related to Blindness.|