Anterior Segment Imaging Predicts Incident Gonioscopic Angle Closure.

Area of Science:

• Ophthalmology
• Medical Imaging
• Glaucoma Research

Background:

• Gonioscopic angle closure is a risk factor for glaucoma.
• Anterior segment optical coherence tomography (AS OCT) offers detailed imaging of the iridocorneal angle.
• Predictive markers for gonioscopic angle closure are essential for early intervention.

Purpose of the Study:

• To determine the incidence of gonioscopic angle closure over 4 years.
• To evaluate the predictive value of AS OCT for angle closure in subjects with initially open angles.

Main Methods:

• Prospective, observational study involving 342 subjects (≥50 years, mostly Chinese).
• Baseline gonioscopy and AS OCT scans were compared with 4-year follow-up data.
• Angle closure defined by non-visible posterior trabecular meshwork (gonioscopy) and iridotrabecular contact (AS OCT).

Main Results:

• None of the 65 control subjects developed gonioscopic angle closure.
• 17.3% of subjects with baseline AS OCT angle closure developed 2+ quadrant closure after 4 years.
• Increased baseline AS OCT angle closure correlated with higher incidence of future gonioscopic angle closure.

Conclusions:

• AS OCT imaging at baseline effectively predicts incident gonioscopic angle closure.
• This predictive capability applies to individuals with initially open angles but iridotrabecular contact on AS OCT.
• AS OCT is a valuable tool for risk stratification in glaucoma screening.