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更新日期：2019-04-10
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Blindness is a lack of vision. It may also refer to a loss of vision that cannot be corrected with glasses or contact lenses.
Partial blindness means you have very limited vision.
Complete blindness means you cannot see anything and DO NOT see light. (Most people who use the term "blindness" mean complete blindness.)
People with vision that is worse than 20/200 with glasses or contact lenses are considered legally blind in most states in the United States.
Vision loss refers to the partial or complete loss of vision. This vision loss may happen suddenly or over a period of time.
Some types of vision loss never lead to complete blindness.
Causes
Vision loss has many causes. In the United States, the leading causes are:
Accidents or injuries to the surface of the eye (chemical burns or sports injuries)
Diabetes
Glaucoma
Macular degeneration
The type of partial vision loss may differ, depending on the cause:
With cataracts, vision may be cloudy or fuzzy, and bright light may cause glare
With diabetes, vision may be blurred, there may be shadows or missing areas of vision, and difficulty seeing at night
With glaucoma, there may be tunnel vision and missing areas of vision
With macular degeneration, the side vision is normal, but the central vision is slowly lost
