Which of the following is the correct way to test for the Oculocephalic reflex?

A. Hold patient's eyelids open and turn their head to left or right while assessing direction of eye movement is correct. The oculocephalic reflex (doll’s eyes reflex) tests the integrity of the brainstem in comatose patients. When the head is turned, the eyes should move in the opposite direction of head rotation if the brainstem is intact. Absence of this movement indicates possible brainstem dysfunction. B. Instill cold water into patient's auditory canal and assess eye movement is incorrect for the oculocephalic reflex; this describes the oculovestibular reflex (caloric test). In this test, cold or warm water or air is instilled into the external auditory canal to stimulate the vestibular system, and eye movement is observed. It is also a test of brainstem function, but it is more invasive, requires intact tympanic membranes, and is not the same as the doll’s eyes maneuver. C. Shine light in patient's eye to assess for pupillary constriction is incorrect because this tests the pupillary light reflex, which involves the optic nerve (CN II) and oculomotor nerve (CN III). While important for neurological assessment, it does not evaluate the brainstem pathways responsible for the oculocephalic reflex, and it cannot replace assessment of the doll’s eyes maneuver in a comatose patient. D. Tap patient's knee to assess for a knee-jerk response is incorrect because this evaluates a spinal reflex (patellar reflex) mediated by local spinal cord circuits, not the brainstem. It is useful for assessing peripheral and spinal cord integrity, but it does not provide information about brainstem function or the oculocephalic reflex.