What Is Legal Blindness?

When people hear the term “legally blind,” they often assume it means total darkness or complete lack of sight. But in reality, legal blindness is a specific clinical definition used by medical professionals, government agencies, and insurers—and it doesn’t mean you can’t see anything at all.

Defining Legal Blindness

In Canada, legal blindness is defined as having a visual acuity of 20/200 or worse in your better eye, even when using corrective lenses. It can also apply to someone with a visual field of 20 degrees or less—also known as tunnel vision.

To put it into perspective, a person with 20/200 vision sees at 20 feet what a person with normal (20/20) vision can see from 200 feet away.

Legal vs. Functional Blindness

It’s important to distinguish between legal blindness and total blindness. Many legally blind individuals can still perceive light, shapes, and movement—and some even navigate daily life independently with visual aids or adaptive tools.

What Causes Legal Blindness?

🔍 Macular degeneration
👁️ Glaucoma
💉 Diabetic retinopathy
🧬 Inherited eye diseases
🚨 Eye injuries or trauma

How OptoDoc Can Help

At OptoDoc, we take your vision seriously. Our comprehensive eye exams use state-of-the-art diagnostic tools to catch early signs of vision loss and help manage chronic conditions before they worsen. If you’re concerned about low vision or suspect you may be approaching the threshold for legal blindness, we’re here to assess, advise, and support you every step of the way.

From referrals to specialists to custom eyewear solutions and ongoing care, our mission is to help you protect what vision you have and improve your quality of life—no matter the diagnosis.

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