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pu·pil·lar·y block(pyū'pi-lār-ē blok)
A blockage of the normal flow of aqueous humour from the posterior to the anterior chamber of the eye. It may be caused by a posterior annular synechia occurring during anterior uveitis, by luxation of the lens anteriorly occluding the pupil, or by adhesion of the iris to the vitreous or to the posterior capsule following extracapsular cataract extraction (called aphakic pupillary block). It may produce an attack of acute angle-closure glaucoma as the iris may be pushed forward blocking the drainage angle. Syn. pupil block. See iris bombé; seclusio pupillae.
pertaining to or emanating from the pupil.
an obstruction to the flow of aqueous between the border of the pupil and the anterior capsule of the lens.
pupillary consensual light reflex
constriction of the pupil in the eye opposite to the one receiving an intensified beam of light, and reversal when the light is removed. The reflex is clearcut in humans and dogs but little used in food animals. Presence of the reflex is a guarantee of integrity of the optic pathways.
see iris cyst.
pupillary light reflex
constriction of a dilated pupil in response to an increase in light intensity and a dilatation of a constricted pupil in response to a decrease in the intensity. Activity of the reflex indicates the efficiency of the retina, the optic and oculomotor nerves and the musculature of the iris.
a surgical technique for resection of an iridocapsular membrane, formed as a sequela to cataract surgery.
persistent pupillary membrane
nonvascular remnants of the tunica vasculosa lentis may extend across the iris or from the iris to the cornea, often producing a corneal opacity at the site. A common defect in dogs, particularly in Basenjis.
the portion of iris closest to the pupillary border.