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Legal blindness is defined as having visual acuity of 20/200 or worse in the better eye with corrective lenses. This standard is used in the United States for various purposes, including eligibility for certain benefits and support services.

When a person has a visual acuity of 20/200, it means that what they can see at 20 feet is what a person with normal vision can see at 200 feet. This significant limitation in vision impacts daily activities and can justify the need for specialized services and accommodations.

The other visual acuity levels mentioned do not meet the threshold for legal blindness. For instance, a level of 20/100 indicates that someone can see at 20 feet what a person with normal vision can see at 100 feet, which does not qualify as legal blindness. Similarly, visual acuities of 20/400 and 20/50, while they indicate different degrees of vision impairment, do not represent the legal definition of blindness. The threshold of 20/200 is crucial in distinguishing between those who are considered legally blind and those who have lesser visual impairments.