You are generally considered legally blind when your best possible vision (with glasses or contacts, if they help) is still very poor or your side vision is extremely restricted.

Core legal definition

Most countries and agencies use two main criteria; you usually only need to meet one of them to be classed as legally blind.

  • Very low central vision (visual acuity)
    • Your best-corrected vision in your better eye is 20/200 or worse (or the metric equivalent, 6/60), even with the right glasses or contact lenses.
* In practical terms, what a person with normal vision can see clearly at 200 feet (60 meters), you can only see at 20 feet (6 meters).
  • Severely narrowed visual field (tunnel vision)
    • Your field of view in your better eye is 20 degrees or less in diameter, even if the central part is relatively clear.
* This is often described as seeing through a small tube or straw, which makes moving around and detecting hazards difficult.

If either of these is true, many systems will classify you as legally blind for benefits, driving rules, and disability protections.

What “legally blind” is (and isn’t)

The term can sound dramatic, but it does not automatically mean seeing nothing at all.

  • It is a legal and administrative definition, not a precise medical diagnosis.
  • Many legally blind people can still see light, large shapes, or very close objects , and some can read large print or use magnification.
  • The definition is used to decide:
    • Eligibility for disability benefits or support programs.
* Whether you are allowed to drive or need restrictions.

* Access to rehabilitation, low-vision aids, and certain tax or transport concessions, depending on the country.

Common misunderstandings

Because the phrase “legally blind” gets thrown around online, there are a few myths.

  • “I’m legally blind without my glasses.”
    • If your vision improves to better than 20/200 with proper correction, you are not considered legally blind in most systems, even if you see very poorly without glasses.
  • “Legally blind means completely blind.”
    • Total blindness (no light perception) is much rarer; legal blindness usually means serious but not total vision loss.
  • “One bad eye = legally blind.”
    • The key measure is usually the better eye , with best correction.
* Someone may be blind in one eye but still not meet legal blindness criteria if the other eye sees well.

When to get checked

If you (or someone you care about) are worried you might be approaching legal blindness, an eye specialist can measure this precisely.

  • They will:
    • Test visual acuity with charts at distance and near.
* Measure your **visual field** to see how wide your side vision is.

* Document the results and, if criteria are met, complete any legal or benefit-related forms required in your region.
  • It is especially important to seek help if you notice:
    • Rapid or recent loss of vision.
    • Increasing difficulty with daily tasks like reading signs, recognizing faces, or navigating safely.

TL;DR: You are considered legally blind if, in your better eye with the best possible glasses or contacts, your vision is 20/200 (6/60) or worse or your visual field is 20 degrees or less.

Information gathered from public forums or data available on the internet and portrayed here.