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.
Common Causes
Blindness has many causes. In the United States, the leading causes are diabetes, glaucoma, macular degeneration, and accidents (such as chemical burns or sports injuries).
Worldwide, the leading causes of blindness are cataracts, onchocerciasis (river blindness), trachoma, leprosy, and vitamin A deficiency.
Other causes include:
- Blocked blood vessels
- Complications of premature birth (retrolental fibroplasia)
- Complications of eye surgery
- Lazy eye
- Optic neuritis
- Stroke
- Tay-Sachs disease
- Retinitis pigmentosa
- Retinoblastoma
- Lead poisoning
- Optic glioma
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 that allow blind people to function independently.
Credit: National Institute of Health.