Which technique should the nurse use to assess the pupillary reaction on a client?
A.
Ask the client to follow the penlight in six directions and observe for bilateral pupil constriction.
B.
Bring a narrow beam of light from the side of the patient’s face and briefly shine the light on the pupil, observing the pupil for constriction.
C.
Hold a finger 6-8 inches from the bridge of the patient’s nose and move finger toward the patient’s nose to observe pupil’s reaction.
D.
Have the client focus on a distant object, then ask the client to look at the penlight being held about 4-6 inches from the nose and observe for pupil constriction.
The correct answer and Explanation is:
The correct technique for assessing the pupillary reaction is:
B. Bring a narrow beam of light from the side of the patient’s face and briefly shine the light on the pupil, observing the pupil for constriction.
Explanation:
To accurately assess the pupillary reaction, the nurse should perform a pupillary light reflex test. This involves shining a narrow beam of light from the side of the patient’s face into one eye and observing the response. Here’s why this technique is effective:
- Direct and Consensual Reaction: When light is directed into one eye, it triggers a reflexive response in both the illuminated eye (direct reaction) and the opposite eye (consensual reaction). This helps evaluate the integrity of the sensory (afferent) and motor (efferent) pathways of the pupillary reflex.
- Normal Response: The expected response is constriction of the illuminated pupil (direct response) and constriction of the opposite pupil (consensual response). This indicates that the optic nerve (CN II) and oculomotor nerve (CN III) are functioning properly.
- Technique Details: Bringing the light from the side ensures that the light does not startle the patient and allows the nurse to observe a clear reaction. The light should be moved quickly and briefly to avoid prolonged exposure, which might affect the pupillary response.
Other Techniques:
- Option A: This technique, involving the penlight in six directions, is more about assessing extraocular movements and is not specific for pupillary reaction.
- Option C: Holding a finger near the nose assesses the convergence of the eyes rather than the pupillary reaction.
- Option D: While this assesses the pupillary reaction to a near stimulus (accommodation), it doesn’t evaluate the pupillary light reflex.
Thus, Option B is the most direct and precise method for assessing pupillary reaction and provides valuable information about the neural pathways involved in vision and reflexes.