A nurse is performing a complete physical examination on a patient. After examining the patient with the Snellen chart, the nurse documented distance vision in both eyes 20/40. The patient asks the nurse what 20/40 means:
20 represents the distance you are placed from the chart and 40 represents the distance a normal eye read the chart.
20 represents the distance a normal eye can read and 40 represents the distance your eye read the chart.
20 represents the distance you are placed from the chart and 40 represents the distance your eye read the chart.
40 represents the distance you are placed from the chart and 20 represents the distance a normal eye read the chart.
The Correct Answer is A
A. 20 represents the distance you are placed from the chart and 40 represents the distance a normal eye reads the chart:
This is correct. The first number (20) represents the distance in feet the patient is from the Snellen chart. The second number (40) indicates the distance at which a person with normal vision can read the same line. Therefore, 20/40 means that what the patient can read at 20 feet, a person with normal vision can read at 40 feet.
B. 20 represents the distance a normal eye can read and 40 represents the distance your eye reads the chart:
This is incorrect. The first number should represent the distance the patient is from the chart, not the normal eye's reading distance.
C. 20 represents the distance you are placed from the chart and 40 represents the distance your eye reads the chart:
This is incorrect. While the first number is correct (the distance from the chart), the second number should represent the distance a person with normal vision can read the same line, not the patient's distance.
D. 40 represents the distance you are placed from the chart and 20 represents the distance a normal eye reads the chart:
This is incorrect. The standard for visual acuity measurements is that the first number represents the testing distance (usually 20 feet), and the second number represents the distance at which a normal eye can read the line.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A) Eye turning inward:
Esotropia is a condition where one or both eyes turn inward, leading to misalignment. This inward turning can cause double vision, depth perception issues, and sometimes amblyopia (lazy eye) if not treated early. This is the primary characteristic that defines esotropia.
B) Eye malalignment:
While eye malalignment is a general term that can describe conditions like esotropia, exotropia, or hypertropia, it does not specify the direction of the misalignment. Esotropia specifically refers to inward turning of the eye, which is a more precise description of the condition.
C) Eye oscillating:
Eye oscillation refers to nystagmus, which is a condition characterized by repetitive, uncontrolled movements of the eyes, often resulting in reduced vision. Nystagmus is not related to esotropia, which involves inward turning rather than oscillation.
D) Eye turning outward:
Eye turning outward is known as exotropia, which is the opposite of esotropia. Exotropia involves the eyes turning away from the nose, whereas esotropia involves the eyes turning towards the nose. These are distinct conditions with different clinical presentations.
Correct Answer is D
Explanation
A) Electrical cords are placed along the walls: While it is important to ensure that electrical cords are safely managed, cords placed along the walls are less likely to pose a tripping hazard compared to those that are left loose or run across walking paths. This setup, in itself, is generally not a significant safety risk if managed properly.
B) Handrails are present in the bathroom: Handrails in the bathroom are actually a safety feature, not a risk. They provide necessary support for older adults with decreased vision or mobility issues, helping to prevent falls when using the toilet or getting in and out of the bathtub or shower.
C) Uses a microwave for cooking: Using a microwave for cooking is generally considered safe for individuals with decreased vision, as it minimizes the risk of burns and other injuries associated with using a stove or oven. The microwave can be a safer cooking method if the client is familiar with its operation.
D) Scatter rugs are present in the kitchen: Scatter rugs are a significant safety risk, especially for older adults with decreased vision. These rugs can easily cause trips and falls, leading to potentially serious injuries. Removing scatter rugs or securing them with non-slip backing can help mitigate this risk and create a safer home environment.
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