What is Pupillary Light Reflex or PLR? скачать в хорошем качестве

What is Pupillary Light Reflex or PLR?

The pupillary light #reflex or photopupillary reflex is a reflex that adjusts the diameter of the #pupil in response to the intensity (brightness) of #light falling on the retinal ganglion cells in the back of the eye, assisting in eyesight ability to adapt to different levels of lightness or darkness. Learn More at https://ecgkid.com _______________________________________________________________________ A higher light intensity causes the pupil to constrict therefore allowing less light in), whereas a lower light intensity leads the pupil to widen thereby allowing more light in. Thus, the pupillary light reflex controls the amount of light that enters the eye. It may be helpful to consider the Pupillary reflex as an 'Iris' reflex, as the iris sphincter and dilator muscles are what can be seen responding to ambient light. The pupillary light reflex is a useful diagnostic tool for assessing the integrity of the eye's sensory and motor processes. To measure brain stem function, emergency physicians often test the pupillary light reflex. Optic nerve injury, oculomotor nerve damage, brain stem lesion (including brain stem death), and depressive medicines such as barbiturates can all cause abnormal pupillary reflexes. Now, Pupillary reflex is conceptually linked to the side (left or right) of the reacting pupil, and not to the side from which light stimulation originates. Left pupillary reflex refers to the response of the left pupil to light, regardless of which eye is exposed to a light source. Right pupillary reflex means reaction of the right pupil, whether light is shone into the left eye, right eye, or both eyes. When light is shone into only one eye and not the other, it is normal for both pupils to constrict simultaneously.