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Updated: May 18, 2026

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Published on: May 5, 2022
Management algorithms for primary angle closure disease
1Queensland Eye Institute, Brisbane, Queensland, Australia.
Abstract:
In contrast to primary open angle glaucoma, preventive interventions in primary angle closure disease (PACD) can sometimes be definitive. Data from randomized, controlled trials - and where this is not available - principles grounded in known biology, biological plausibility, logic, preferred practice and personal experience have been synthesized to develop explicit clinical algorithms for management of the spectrum of PACD. The mainstay of first-line intervention is usually a laser iridotomy: a commonly necessary but sometimes insufficient manoeuvre in PACD. The crucial stepwise considerations after iridotomy are: whether the angle is open or closed; whether the IOP can be medically controlled; the extent of PAS, and the presence of visually significant cataract. Indication for subsequent interventions--which may include iridoplasty, cataract surgery, trabeculectomy or phacotrabeulectomy--are herein based on an arbitrary threshold (180 degrees) for angle opening and extent of PAS following initial treatment.
Insights
Preventive interventions for primary angle closure disease (PACD) can be definitive. This study outlines clinical algorithms for PACD management, including laser iridotomy and subsequent treatments based on angle status and intraocular pressure.
Area of Science:
- Ophthalmology
- Medical Interventions
Background:
- Primary angle closure disease (PACD) management differs from primary open-angle glaucoma.
- Preventive interventions in PACD can offer definitive outcomes.
Purpose of the Study:
- To synthesize data and principles into explicit clinical algorithms for managing the spectrum of PACD.
- To guide stepwise interventions following initial treatments for PACD.
Main Methods:
- Synthesis of data from randomized controlled trials and established biological principles.
- Development of clinical algorithms based on angle status, intraocular pressure control, synechiae extent, and cataract presence.
- Utilizing a 180-degree threshold for angle opening and PAS extent post-treatment.
Main Results:
- Laser iridotomy is the primary first-line intervention for PACD.
- Stepwise considerations post-iridotomy include angle status, IOP control, PAS extent, and cataract.
- Indications for further interventions like iridoplasty, cataract surgery, or trabeculectomy are defined by specific thresholds.
Conclusions:
- Explicit clinical algorithms can guide definitive management of PACD.
- A structured, stepwise approach is crucial for optimizing outcomes in PACD patients.
- Interventions are tailored based on a comprehensive assessment of the angle and ocular structures.
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