Final answer:
When performing a pupillary light reflex test, the light source must not be shined directly into the patient's eye. The light is introduced from the side to check for direct and consensual responses, which are indicative of optic and oculomotor nerve function.
Step-by-step explanation:
For the direct and consensual responses of the eye, it is important that the light source must not be shined directly into the patient's eye.This is because shining a light directly into the eye can cause discomfort and potential harm to the patient's vision. It is recommended to avoid shining the light directly into the eye and instead use indirect methods to properly observe the eye.By using alternative methods, such as shining the light onto the patient's forehead or eye socket, healthcare professionals can still achieve accurate results without causing any harm to the patient.
For the examination of direct and consensual pupillary responses, the correct answer is B) Must not. When testing pupillary light reflex, it is pertinent that the light source must not be shined directly into the patient's eye at a high intensity or for an extended period, as this could cause discomfort or potentially damage the retina. The light should be introduced from the side to observe the direct response in the eye being illuminated and the consensual response in the opposite, unilluminated eye. This procedure helps assess the function of the optic (II) and oculomotor (III) nerves as part of a neurological examination.