pupillary block


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pupillary block

increased resistance to flow of aqueous humor through the pupil from the posterior chamber to the anterior chamber, leading to anterior bowing of the peripheral iris over the trabecular meshwork and to angle-closure glaucoma.

pu·pil·lar·y block

(pyū'pi-lār-ē blok)
Increased resistance to flow of aqueous humor through the pupil from the posterior chamber to the anterior chamber, leading to anterior bowing of the peripheral iris over the trabecular meshwork and to angle-closure glaucoma

pupillary block 

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.

pupillary

pertaining to or emanating from the pupil.

pupillary aperture
the pupil.
pupillary block
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.
pupillary constriction
see miosis.
pupillary cyst
see iris cyst.
pupillary dilatation
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.
pupillary membranectomy
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.
pupillary zone
the portion of iris closest to the pupillary border.
References in periodicals archive ?
As far as PPV is concerned, ACD changes are attributed to endotemponade, anterior shifting of iris-lens diaphragm and pupillary block that are dependent on type of temponading agent and other ophthalmic conditions.
In the contralateral eyes of the enrolled patients, either trabeculectomy or laser peripheral iridoctomy was performed to eliminate reverse pupillary block, and the iris recovered to flat or regular.
Acute angle closure may result from pupillary block caused by the forward movement of the spherical lens or anterior chamber luxation of the lens due to weak and long zonules.
Anterior chamber (AC), although absent in periphery, proved normal depth centrally (important element for primary causes of angle closure and not secondary related to pupillary block in anterior uveitis).
In cases of pupillary block glaucoma occurring with posterior capsular tear and vitreous loss we performed Nd YAG laser iridotomy (ies) after first lowering the intra ocular pressure with IV Mannitol and oral acetazolamide.
The first type is a Phacomorphic secondary angle-closure pupillary block glaucoma due to senile cortical cataract intumescent stage.
12 The placement of IOL in the posterior chamber rather than anterior or iris fixated lenses reduces the risk of various complications like keratopathy damage to anterior chamber angle structure pupillary block glaucoma hyphema uveitis iris chafing dislocationandpseudophakodonesis.
As the mechanism of angle closure does not involve pupillary block peripheral iridotomy is ineffective in these cases.
Eyes with a pupillary block, a diagnosis of glaucoma prior to PPV, neovascular glaucoma, a history of other ocular diseases such as uveitis, and cases with previous history of any types of glaucoma or glaucoma surgery were excluded from the study.
P suggested the possibility of anterior uveal tract metastasis leading to angle closure with pupillary block.
LPI is an easy and effective treatment for closed angle in situations in which LI either cannot be performed or does not repair the appositional angle closure because mechanisms other than pupillary block are present.
Intraocular silicone oil can produce glaucoma through a variety of mechanisms: pupillary block, synechial angle closure, inflammation, neovascular glaucoma & migration of oil into the anterior chamber.