By birth defects, or a very serious injury. Go to www.preventblindness.org/safety/ to get ways on how to be safe!
Blindness is lack of vision in your eyes. There is such thing as being blind in one eye, but that's very rare.
julia davies
"Less developed"
Developed countries are those that have diverse, robust, and well established economies with substantial physical infrastructure and support system such as educations and health care. They are...