For normal pupillary light reflex, both pupils constrict simultaneously when light is shone into either eye. For example, if light is shone into left eye only, left pupil constriction is a direct pupillary light reflex, and simultaneous right pupil constriction is a consensual pupillary light reflex. Therefore, light shone into one eye causes ipsilateral direct pupillary light reflex and contralateral consensual pupillary light reflex.