Final answer:
To carry out the light reflex test, shine a light into one eye and observe for constriction of the pupil. This test helps assess the health of the optic nerve and the oculomotor nerve.
Step-by-step explanation:
Shining a light in one eye and observing for constriction of the pupil is the correct way to carry out the light reflex test. This test involves shining a penlight in the eye to stimulate the pupillary light reflex. When light hits the retina, it causes a signal to travel along the optic nerve, resulting in the constriction of both pupils. This reflex can be used to assess the health of the optic nerve and the oculomotor nerve.