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Diseases reference index «Blindness and vision loss»

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 worse than 20/200 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.


Blindness has many causes. In the United States, the leading causes are:

  • Accidents or injuries to the surface of the eye (such as 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 there may be problems seeing shapes
  • 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 blurry vision
  • With macular degeneration, the side vision is normal but the central vision is slowly lost

Other causes include:

  • Blocked blood vessels
  • Complications of premature birth (retrolental fibroplasia)
  • Complications of eye surgery
  • Lazy eye
  • Optic neuritis
  • Stroke
  • Retinitis pigmentosa
  • Tumors such as retinoblastoma and optic glioma

Home Care

The kind of home assistance you need will depend on your type of vision loss. It is important for a blind person to be able to dress, eat, function independently, and stay safe.

Many services are available that provide the training and support blind people need to function independently.

Ideas to keep things organized at home:

  • Always keep certain items in the same drawer, cabinet, table, or counter space.
  • Learn to recognize the shape of certain items, such as egg containers or cereal boxes.
  • Use plastic rings to hold pairs of socks together, whether you are washing, drying, or storing them.
  • Use small Braille labels, including a simple form of Braille called uncontracted Braille.
  • Use small raised dots, rubber bands, Velcro, or colored tape to label items that are hard to read.
  • Use caulking, raised rubber, or plastic dots to mark the "on," "bake," and certain temperature settings on the furnace thermostat and dials on stoves, toasters, the washer, and dryer.
  • Use a phone with large numbers and memorize the keypad.
  • Fold different types of paper money in a different way. For example, you can fold a $10 bill in half or double fold a $20 bill.
  • Use Braille or large-print checks.

Tips to help you get around and stay safe at home:

  • If possible, learn to use a long white cane to help you get around on your own.
  • When walking with someone else's help, grasp their arm just above the elbow. Walk slightly behind them to follow their motions.
  • Remove lose wires or cords from the floor.
  • Remove loose throw rugs.
  • Do not keep small pets in your home.
  • Fix any uneven flooring in doorways.
  • Have good lighting.
  • Put hand rails in the bathtub or shower and next to the toilet.
  • Place a slip-proof mat in the bathtub or shower.

A number of different low-vision aids can help:

  • Magnifiers
  • Technology aids to make it easier to use cell phones and computers
  • Watches made for people with low vision, or talking watches and clocks

When to Contact a Medical Professional

Sudden vision loss is always an emergency, even if you have not completely lost all vision. You should never ignore loss of vision, thinking it will get better.

Contact an ophthalmologist or go to the emergency room immediately. Most serious forms of vision loss are painless, and the absence of pain in no way diminishes the urgent need to get medical care. Many forms of vision loss only give you a short amount of time to be successfully treated.

What to Expect at Your Office Visit

A complete and thorough eye examination will be performed. The treatment will depend on the cause of the vision loss.

For long-term vision loss, see a low-vision specialist, who can help you learn to care for yourself and live a full life.

Alternative Names

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