Legally Blind | Causes and Types of Blindness | Essilor

Facts About Blindness

Types of Blindness

Blindness refers to a loss of vision that cannot be corrected with glasses or contact lenses.

Partial Blindness.Partial blindness means you have very limited vision.

Complete Blindness.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.

Causes of Vision Loss

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 (chemical burns or sports injuries)
  • Diabetes (uncontrolled diabetes often leads to irreparable damage to the retina)**
  • Glaucoma
  • Macular degeneration

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