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.

Answer and Explanation

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.

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Correct Answer is B

Explanation

(a) Soles of the feet:

The soles of the feet are not considered the most reliable indicator of central cyanosis because peripheral areas can be affected by various factors, including temperature and circulation. Changes in color here might not accurately reflect central oxygenation status.

(b) Oral mucosa:

The oral mucosa is the most reliable indicator of central cyanosis because it reflects the oxygenation status of the central circulatory system. Cyanosis in this area indicates a significant drop in arterial oxygen saturation and is a more direct indicator of hypoxemia compared to peripheral sites.

Ear lobes, like the soles of the feet, can be influenced by peripheral circulation and environmental factors. While cyanosis can be observed here, it is not as reliable as central sites like the oral mucosa for assessing systemic oxygenation.

(d) Conjunctivae:

The conjunctivae can show signs of cyanosis, but the oral mucosa is still a more sensitive and reliable indicator for central cyanosis. The oral mucosa provides a clear and consistent site to assess oxygenation in emergency situations.

A. Snellen chart B. Penlight C. Magazine D. Ophthalmoscope

Correct Answer is C

Explanation

A) Snellen chart:

The Snellen chart is used to assess distance vision, not near vision. It consists of letters or symbols arranged in rows, with the client typically asked to read from a specific distance to test visual acuity.

B) Penlight:

A penlight is primarily used to assess pupillary reactions and near vision tasks such as accommodation. It helps examine how the pupils respond to light and how well the eyes focus on near objects.

C) Magazine:

A magazine or similar reading material is commonly used to assess near vision. Clients are asked to read the text at a comfortable distance, evaluating their ability to focus on close-up objects and the clarity of their vision.

D) Ophthalmoscope:

An ophthalmoscope is used to examine the interior structures of the eye, such as the retina and optic nerve head. It is not used for assessing near vision but rather for diagnosing conditions affecting the eye's internal structures.

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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:

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