A patient is diagnosed with low vision. According to the standard classification, which Best Corrected Visual Acuity (BCVA) range defines this condition?

1. A

   20/20 to 20/60

2. B

   20/70 to 20/200

3. C

   20/400 to no light perception

4. D

   Less than 20/500

Appeared in: NORCET 3 - 2022 (Shift-1)

Explanation

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• Low vision is clinically defined as having a best-corrected visual acuity (BCVA) that falls between 20/70 and 20/200 in the better-seeing eye.
• This range represents moderate to severe visual impairment, which is not correctable with standard eyeglasses but has not yet reached the level of legal or total blindness.
• Individuals in this category require assistive devices and strategies to perform daily visual tasks.

Why Other Options Were Wrong

• Option A: This range (20/20 to 20/60) represents normal to near-normal vision (mild visual impairment), not low vision.
• Option C: This range (20/400 to no light perception) is classified as blindness, which is a more severe category than low vision.
• Option D: This value (less than 20/500) indicates profound or total blindness, a level of impairment far more severe than low vision.

Related Visual

• Visual 1: Infographic - A chart illustrating the spectrum of visual acuity from normal vision (20/20) to total blindness, with clear labels for 'Low Vision', 'Legal Blindness', and other categories.
• Visual 2: Diagram - A simulated view through the eyes of a person with low vision versus a person with normal vision to help understand the functional impact.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Classification of visual impairment based on Best Corrected Visual Acuity (BCVA) to guide bedside assessment, documentation, and the next nursing action.
• Nurses must accurately identify a patient's level of vision to implement appropriate safety measures, such as ensuring a clutter-free environment and adequate lighting, to prevent falls and injury.
• Understanding the distinction between low vision and blindness is crucial for patient education, recommending appropriate assistive devices (e.g., magnifiers vs. Braille), and making referrals to vision rehabilitation services.
• What if the patient's vision was exactly 20/200? In the United States, a BCVA of 20/200 or worse in the better eye defines 'legal blindness,' making the patient eligible for specific government and social support services, which is an important point for discharge planning and resource referral.

How to Approach the Question

• First, identify the key term in the question: 'low vision'.
• This is a factual recall question that requires knowledge of standard medical classifications.
• Recall the different categories of visual acuity: normal, mild impairment, low vision (moderate/severe impairment), and blindness.
• Mentally place the given options along this spectrum. The range for 'low vision' will be situated between near-normal vision and blindness.
• Eliminate the ranges that define normal vision (e.g., 20/20 to 20/60) and blindness (e.g., 20/400 or worse).
• Select the option that correctly fits the established definition of low vision, which is typically 20/70 to 20/200.

Concept Tested & Keywords

• Concept Tested: Classification of visual impairment based on Best Corrected Visual Acuity (BCVA)
• Stem keywords: low vision, standard classification, Best Corrected Visual Acuity, BCVA
• Lead-in keywords: which range defines

Question ID

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