Anterior Segment Parameter Changes after Cataract Surgery in Open-Angle and Angle-Closure Eyes: A Prospective Study

Area of Science:

• Ophthalmology
• Glaucoma Research
• Anterior Segment Imaging

Background:

• Cataract surgery impacts anterior segment parameters differently in various glaucoma types.
• Understanding ciliary process rotation is crucial for managing primary angle-closure glaucoma (PACG).

Purpose of the Study:

• To compare anterior segment changes after cataract surgery in open-angle and primary angle-closure glaucoma (PACG) eyes.
• To investigate the relationship between crystalline lens removal and ciliary process anterior rotation.

Main Methods:

• Prospective observational study of 66 patients undergoing cataract surgery.
• Ultrasound biomicroscopy measured anterior segment parameters (trabecular-ciliary process distance, ciliary process area, trabecular-ciliary angle (TCA), ciliary body thickness (CBTmax)) pre- and post-operatively.
• Patients were categorized into chronic PACG, acute PACG, and open-angle cataract groups.

Main Results:

• Significant increases in TCA and CBTmax observed across all groups post-surgery.
• No significant changes in trabecular-ciliary process distance noted in any group.
• No significant inter-group differences in the changes of ciliary process area, TCA, or CBTmax were found.

Conclusions:

• Crystalline lens extraction similarly reduces ciliary process anterior rotation in both open-angle and angle-closure eyes.
• Intrinsic anatomical abnormalities appear to be a more significant factor in ciliary process anterior rotation in PACG patients.