Legal blindness is defined as which of the following visual acuity measures on an eye test?

Legal blindness is defined as having a visual acuity of 20/200 or worse in the better seeing eye, even with the best possible correction (such as glasses or contact lenses). This means that at a distance of 200 feet, a person with legal blindness can see what a person with normal vision can see at 20 feet. This definition is critical for determining eligibility for various services and benefits, such as those provided by rehabilitation programs and government agencies.

Visual acuity measures are used to assess the clarity or sharpness of vision. The higher the second number in the fraction, the worse the vision is considered. Therefore, a visual acuity measure of 20/200 qualifies as legal blindness because it indicates significant visual impairment. In contrast, measures like 20/40, 20/100, and even 20/400 refer to varying levels of visual impairment, but only 20/200 meets the criteria specified for legal blindness.