Sussman Scheie classification of the anterior chamber angle uses which method?
- A Spaeth classification system with gonioprism and illumination angle
- B Indentation gonioscopy with Zeiss 4-mirror lens to differentiate appositional from synechial closure
- C Van Herick slit-lamp estimation of peripheral anterior chamber depth without gonioscopy ✓
- D Anterior segment OCT (AS-OCT) measurement of angle recess area
Correct answer: C. Van Herick slit-lamp estimation of peripheral anterior chamber depth without gonioscopy
Explanation
The Van Herick (also associated with Sussman-Scheie) technique uses a narrow slit-lamp beam at the temporal limbus to estimate the ratio of peripheral corneal thickness to the anterior chamber depth. A ratio <1/4 suggests a narrow angle at risk for closure. This is a rapid screening method without a gonioscopy lens. Indentation gonioscopy with Zeiss 4-mirror lens is the gold standard for distinguishing appositional from synechial closure. AS-OCT provides quantitative angle parameters. Spaeth's system provides the most detailed gonioscopic classification.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.