A client’s chart indicates that they are legally blind. Which of the following is the definition of legally blind?
A.
Full vision loss in at least one eye
B.
The best-corrected vision in the better eye of 20/200 or less
C.
Inability to see clearly from 200 feet away without corrective lenses
D.
Bilateral visual impairment of 20/60 or greater
The Correct Answer and Explanation is:
The correct answer is B. The best-corrected vision in the better eye of 20/200 or less.
Explanation:
Legally blind is a term used to define a level of visual impairment that qualifies an individual for certain benefits and services under various laws. The definition of legal blindness can vary slightly depending on the country, but it typically focuses on visual acuity, which is a measure of the sharpness or clarity of vision.
- Visual Acuity Measurement: Visual acuity is measured using a Snellen chart, which is a chart with letters or symbols of varying sizes. This measurement is taken under standardized conditions, often with corrective lenses, to determine the sharpness of vision.
- Legal Blindness Criteria: In the United States, the definition of legal blindness is specified as having the best-corrected visual acuity of 20/200 or less in the better eye. This means that even with the best possible correction (such as glasses or contact lenses), the person can see at 20 feet what a person with normal vision can see at 200 feet. This criterion is used because it indicates a significant reduction in visual acuity that impacts daily functioning.
- Comparing to Other Options:
- A. Full vision loss in at least one eye is not accurate because legal blindness does not require the complete loss of vision in one eye; it is based on acuity in the better eye.
- C. Inability to see clearly from 200 feet away without corrective lenses is incorrect because legal blindness is determined with the use of corrective lenses.
- D. Bilateral visual impairment of 20/60 or greater refers to a significant visual impairment but does not meet the legal blindness criteria, as 20/60 is not considered legally blind.
Additional Considerations:
- Field of Vision: Legal blindness can also be defined by a very restricted field of vision, often less than 20 degrees in diameter. However, visual acuity is the more commonly used measure.
- Eligibility for Services: Individuals meeting the legal blindness criteria may be eligible for various support services, including rehabilitation programs, financial assistance, and specialized educational services.
In summary, the definition of legal blindness is primarily based on having a best-corrected visual acuity of 20/200 or less in the better eye, which highlights the level of vision impairment necessary to qualify for legal blindness status.