Association of iris crypts with acute primary angle closure

Area of Science:

• Ophthalmology
• Anatomic Pathology
• Glaucoma Research

Background:

• Angle closure glaucoma is a significant cause of vision loss.
• Iris morphology is implicated in the pathophysiology of angle closure.
• Understanding iris surface features may aid in risk stratification for acute primary angle closure (APAC).

Purpose of the Study:

• To investigate the association between iris surface characteristics and the occurrence of acute primary angle closure (APAC).
• To determine if iris crypts, furrows, or color are predictive of APAC in individuals with angle closure.

Main Methods:

• A case-control study was conducted with Asian patients diagnosed with various forms of angle closure.
• Iris surface features (crypts, furrows, color) were digitally photographed and graded.
• Eyes with a history of APAC were compared to those with primary angle closure suspect (PACS) and primary angle closure/glaucoma (PAC/PACG).

Main Results:

• A total of 309 patients were included in the study.
• Higher iris crypt grading was significantly associated with lower odds of developing APAC compared to PACS and PAC/PACG groups.
• No significant association was found between iris furrows or color and the presence of APAC.

Conclusions:

• Increased iris crypts may confer a protective effect against APAC in Asian eyes with angle closure.
• Iris surface architecture, specifically crypt grading, could serve as a novel biomarker for APAC risk stratification.