How to test for Light Reflex?
When light falls on one eye, there is constriction of both the pupils. The pupillary reaction on the stimulated side is called ‘direct’ light reflex, and the pupillary constriction of the other eye is known as ‘consensual’ light reflex. 1) Pencil torch is used with good power of illumination. 2) The patient is asked to look straight forward a distant object and the light is thrown suddenly from periphery (to avoid the accommodation reflex). The pupil constricts promtly. 3) For direct light reflex, opposite eye should be closed by the hollow of the other palm. 4) For consensual light reflex, one hand of the patient is placed over the nose (like a curtain) to prevent the spillage of light to the other eye. Both the eyes are kept one. When light falls on one eye, observe the pupillary constriction of the other eye. 5) The afferent pathway – optic nerve, efferent pathway – oculomotor nerve, centre – ciliary ganglion, response – constriction of both the pupils. * For both the direct and con
