Consensual response
Consensual response
Consensual response (/kənˈsɛnʃuːəl rɪˈspɒns/; from Latin consensus, "agreement" + responsio, "reply") is a reflex action commonly observed in the field of Ophthalmology. It refers to the simultaneous constriction of the pupil in the eye not directly exposed to light, when light is shone into the other eye. This is a part of the Pupillary light reflex mechanism.
Etymology
The term "consensual" is derived from the Latin word consensus, which means agreement. The term "response" is derived from the Latin word responsio, which means reply. In this context, it refers to the agreement or correspondence of one eye's response to the stimulus received by the other eye.
Function
The consensual response is a crucial part of the Pupillary light reflex (PLR). The PLR is a reflex that controls the diameter of the pupil, in response to the intensity of light that falls on the retinal ganglion cells of the eye. The consensual response ensures that both pupils constrict when one eye is exposed to light, thus maintaining the balance of light entering both eyes.
Clinical significance
The absence of a consensual response can indicate a number of medical conditions, including Optic neuritis, Afferent pupillary defect (also known as Marcus Gunn pupil), and lesions in the Optic nerve or Oculomotor nerve. Therefore, testing for the consensual response is a standard part of neurological and ophthalmological examinations.
Related terms
- Direct response: The constriction of the pupil in the eye directly exposed to light.
- Pupillary light reflex: The reflex that controls the diameter of the pupil in response to light.
- Afferent pupillary defect: A medical condition characterized by a decreased pupillary response to light in one eye.
- Optic neuritis: Inflammation of the optic nerve that can cause a loss of vision.
- Oculomotor nerve: The third cranial nerve, which controls most of the eye's movements and pupil constriction.
External links
- Medical encyclopedia article on Consensual response
- Wikipedia's article - Consensual response
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