Blindness and vision loss

Loss of vision; No light perception (NLP); Low vision; Vision loss and blindness

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.

Neurofibromatosis I, enlarged optic foramen

This x-ray shows the skull of a child with neurofibromatosis (NF-1). This child developed visual difficulties and was discovered to have a glioma (nerve tumor) in the optic nerve. The tumor has enlarged the bony opening (optic foramen), through which the optic nerve passes. This can be seen on the right side of picture.

Causes

Home Care

When to Contact a Medical Professional

What to Expect at Your Office Visit