A nurse has completed the assessment of a client's direct pupillary response and is now assessing consensual response. This aspect of assessment should include which action?

Pupillary light reflexes are mediated by cranial nerves II (afferent pathway) and III (efferent pathway), reflecting midbrain integrity and autonomic nervous system function. Consensual pupillary response refers to the contralateral eye’s involuntary constriction when light is directed into one eye. This response confirms intact neural transmission between optic pathways and oculomotor nuclei bilaterally. Rationale: A. Having the client report when a finger enters peripheral vision assesses visual field integrity, not pupillary reflexes. This technique evaluates cranial nerve II function and peripheral vision deficits. It does not assess consensual pupillary response, which is an involuntary reflex mediated at the brainstem level. B. Observing the eye’s reaction when a light is shone into the opposite eye directly evaluates the consensual pupillary reflex. When one retina is stimulated, both eyes constrict due to bilateral activation of the Edinger-Westphal nuclei. This confirms intact cranial nerve III and midbrain coordination. C. Shining light into one eye while covering the other assesses the direct pupillary response and helps isolate unilateral afferent or efferent defects. The covered eye cannot demonstrate consensual response because visual input is blocked, making this method incorrect for evaluating bilateral reflex activity. D. Comparing dilated and constricted pupil size evaluates pupil symmetry (anisocoria) rather than reflex pathways. This observation is descriptive and static, not a functional test of neurological reflexes. It does not assess consensual response or cranial nerve integrity.