Pupillary Light Reflex
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The pupillary light reflex is a very unique and interesting way that the eye captures images and manages light exposure.
Pupillary light reflex. The reflex arc includes optic nerve cn ii pretectal nucleus of midbrain accessory oculomotor nucleus and oculomotor nerve cn iii. This leads to the formation of an image by the brain. Other articles where pupillary light reflex is discussed. 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 1 pupillary constriction occurs via innervation of the iris sphincter muscle which is controlled by the parasympathetic system 2.
Reversed pupillary reflex any abnormal pupillary reflex opposite of that which occurs normally. Impaired pupillary light reflex normally pupils react ie constrict equally. A blink response to light develops at about the same time and the lid may remain closed for as long as light is present the dazzle reflex. An rapd is diagnosed by observing paradoxical dilatation when light is directly shone in the affected pupil after being shown in the healthy pupild to be from a pathologic process this decrease in constriction or widening of the pupil is due to reduced stimulation of the visual pathway by the pupil on the affected side.
The retina the pretectum and the midbrain. Testing of the pupillary light reflex is useful to identify a relative. Almost like a camera the eye adjusts the amount of light that enters to create the perfect setting. Pupillary light reflex and accommodation reflex although pupillary response where the pupil dilates or constricts due to light is not usually called a reflex it is still usually considered a part of this topic adjustment to close range vision is known as the near response while inhibition.
This response called the light reflex is regulated by three structures. The pupillary light reflex plr or photopupillary reflex 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 retina in the back of the eye thereby assisting in adaptation of vision to various levels of lightness darkness. E g stimulation of the retina by light dilates the pupil. The pupillary light reflex is a test of the functional integrity of the subcortical afferent and efferent pathways and is reliably present after 31 weeks gestation.
Pupillary reflex refers to one of the reflexes associated with pupillary function. In the retina is a three neuron circuit consisting of light sensitive photoreceptors rods bipolar cells and retinal ganglion cells. Comparing the direct and consensual reaction to light in both eyes is helpful in locating a lesion remembering that the retina and optic nerve are needed for the afferent signal and that the oculomotor nerve provides the efferent component of both the direct and. Righting reflex the ability to assume an optimal position when there has been a departure from it.
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