What is seclusion of pupil?
What is seclusion of pupil?
seclusion of pupil. The condition resulting from posterior annular synechia, in which the iris is bound down throughout the entire pupillary margin, butthe pupil is not occluded. Synonym: exclusion of pupil.
What is the medical term for pupil?
Medical Definition of pupillary : of or relating to the pupil of the eye.
What is an iris bombe?
Iris bombe is a condition in which there is apposition of the iris to the lens or anterior vitreous, preventing aqueous from flowing from the posterior to the anterior chamber. The pressure in the posterior chamber rises, resulting in anterior bowing of the peripheral iris and obstruction of the trabecular meshwork.
How does the retina detect light?
When light hits the retina (a light-sensitive layer of tissue at the back of the eye), special cells called photoreceptors turn the light into electrical signals. These electrical signals travel from the retina through the optic nerve to the brain. Then the brain turns the signals into the images you see.
What is the function of the pupillary light reflex?
Pupillary light 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 1). Pupillary constriction occurs via innervation of the iris sphincter muscle, which is controlled by the parasympathetic system 2).
What causes consensual light reflex of the contralateral pupil?
The contralateral efferent limb causes consensual light reflex of the contralateral pupil. The optic nerve, or more precisely, the photosensitive ganglion cells through the retinohypothalamic tract, is responsible for the afferent limb of the pupillary reflex; it senses the incoming light.
What is the pathophysiology of pupillary constriction?
Pupillary constriction occurs via innervation of the iris sphincter muscle, which is controlled by the parasympathetic system 2). Testing of the pupillary light reflex is useful to identify a relative afferent pupillary defect due to asymmetric afferent output from a lesion anywhere along the afferent pupillary pathway as described above 3).
Why do pupils dilate in relative afferent pupillary defect?
In patients with an relative afferent pupillary defect, when light is shined in the affected eye, there will be dilation of both pupils due to an abnormal afferent arm 4). When the examiner swings the light to the unaffected eye, both pupils constrict.
