Is it possible that during direct light reflex test the pupil will not react but in consensual reflex it will react?

First test the direct light reflex – a normal pupil will constrict when light is directed to it. However, observe the other eye – the other pupil will constrict even without exposure to light (consensual light reflex).

What causes consensual light reflex?

The consensual light reflex occurs because both the optic and tectotegmental tracts carry fibers from both eyes. The efferent (motor) pupillary pathway has both parasympathetic and sympathetic nervous system actions.

What is the difference between direct and consensual pupillary reflex?

A direct pupillary reflex is pupillary response to light that enters the ipsilateral (same) eye. A consensual pupillary reflex is response of a pupil to light that enters the contralateral (opposite) eye.

What is consensual pupillary light reflex?

The reflex is consensual: Normally light that is directed in one eye produces pupil constriction in both eyes. The consensual response is the change in pupil size in the eye opposite to the eye to which the light is directed (e.g., if the light is shone in the right eye, the left pupil also constricts consensually).

How do you check your pupillary reflex?

Performing the Exam for Pupillary Responses

1. Observe the pupil size and shape at rest, looking for anisocoria (one pupil larger than the other)
2. Observe the direct response (constriction of the illuminated pupil)
3. Observe the consensual response (constriction of the opposite pupil)
4. Repeat with the opposite pupil.

Which of the following statement is an example of the consensual light reflex?

Which of the following statements is an example of the consensual light reflex? The pupil of the right eye constricts while shining a flashlight into the left eye.

What happens to the iris in bright light?

The colored part of the eye which helps regulate the amount of light entering the eye. When there is bright light, the iris closes the pupil to let in less light. And when there is low light, the iris opens up the pupil to let in more light.

What type of reflex is the pupillary reflex?

autonomic reflex
The pupillary light reflex is an autonomic reflex that constricts the pupil in response to light, thereby adjusting the amount of light that reaches the retina. Pupillary constriction occurs via innervation of the iris sphincter muscle, which is controlled by the parasympathetic system.

How do I record my pupil reaction?

Method: Use a bright handheld light in a dim room. Shine the light in one of the patient’s eyes and observe for a reaction. After ~3 seconds, rapidly swing the light to the opposite pupil and observe the reaction. After ~3 seconds, swing back to the first eye and observe again.

What is the iris reflex?

The pupil reflex The amount of light entering the eye is controlled by a reflex action . The size of the pupil changes in response to bright or dim light. This is controlled by the muscles of the iris.