Primary Angle Closure and Angle Closure Glaucoma

Synonyms

Narrow angle glaucoma; Narrow drainage angle

Definition

Primary angle closure is defined by iridotrabecular contact in eyes with an anatomic predisposition but no further pathology causing narrow angle or peripheral anterior synechiae (PAS).

In primary angle closure, elevated intraocular pressure (IOP) or PAS are present, but no evidence for glaucomatous optic neuropathy (GON) is seen. Features indicating that trabecular obstruction by the peripheral iris has occurred, as well as symptoms suggestive of episodes of primary acute angle closure, may be found.

The term primary angle closure glaucoma is used if GON is present, although elevation of IOP or PAS may be absent at the time of initial examination.

Primary acute angle closure is defined by an excessive rise of IOP with acute symptoms, whereas intermittent primary angle closure is a condition in which angle closure occurs with abortive symptomatic.

Chronic primary angle closure is defined as synechial closure (angle...