Which test compares the direct and consensual responses to the pupil?

The swinging flashlight test is specifically designed to compare the direct and consensual responses of the pupils to light. During this test, a light source is alternately moved between the two eyes, allowing the clinician to observe how each pupil reacts. The direct response refers to the constriction of the pupil that is exposed to light, while the consensual response is the constriction of the opposite pupil.

This test is particularly useful for identifying afferent pupillary defects, such as in conditions like Marcus Gunn pupil, where the affected eye may demonstrate a diminished or absent response compared to the healthy eye. The swinging flashlight test thus effectively highlights differences in pupillary reaction, making it a crucial tool in neurological assessments.

Other tests listed, such as the Worth four-dot test, primarily assess binocular vision and depth perception, the pinhole disk is used to evaluate refractive errors, and the cover-uncover test evaluates for strabismus. None of these tests focus directly on comparing the direct and consensual pupillary responses, which solidifies the swinging flashlight test as the correct choice for this question.