Decrease (-) Restore Default Increase (+)
Bookmark and Share

Health Library

Back to MainBack to Main   Print This Page Print    Email to a Friend Email
 

Blindness and vision loss

Definition

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.

Alternative Names

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

Common Causes

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

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

Other causes of vision loss include:

Home Care

When you have low vision, you may have trouble driving, reading, or doing small tasks such as sewing or making crafts. You can make changes in your home and routines that help you stay safe and independent. Many services will provide you with the training and support you need to live independently.

Call your health care provider if

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 health care provider's office

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.

References

Kraut JA. Vision rehabilitation. In: Tasman W, Jaeger EA, eds. Duane's Ophthalmology. On DVD-ROM, 1st ed. Philadelphia, Pa: Lippincott Williams & Wilkins; 2012:chap 46.

Olitsky SE, Hug D, Smith LP. Disorders of Vision. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa: Saunders Elsevier;2011:chap 613.

Yanoff M, Cameron D. Diseases of the visual system. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 431.


Review Date: 9/3/2012
Reviewed By: Linda J. Vorvick, MD, Medical Director and Director of Didactic Curriculum, MEDEX Northwest Division of Physician Assistant Studies, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington; and Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
adam.com
 

Medical Care

Cancer
Pregnancy & Prenatal Classes
Weight Loss
Orthopedics
Heart Disease
Neurology
Women's Health
More Medical Care

Locations

Hospitals
Immediate Care
Health Centers
Emergency Room
Doctors Offices
Specialists
Affiliate Hospitals

Patients and Visitors

MyChart
Pay Your Bill
Request an Appointment
Get Healthy
Support Groups
Fitness Groups
Mobile Applications
Clinical Trials
Online Nursery
Classes and Events
Send an eCard
Patient Stories
Places to Stay
Say Thanks

About Us

Quality Report 
Careers
Ways to Help
Community Outreach
Contact Us
(502) 629-1234

Connect with us

© 2014 Norton Healthcare
Serving Kentucky and Southern Indiana