Gonioscopy of a patient with elevated IOP reveals a broad iridocorneal apposition with the trabecular meshwork not visible at any quadrant even after indentation. The Shaffer grade of this angle is:
- A Grade 1
- B Grade 0 ✓
- C Grade 2
- D Grade 3
Correct answer: B. Grade 0
Explanation
Shaffer's grading system classifies the anterior chamber angle width: Grade 0 indicates a closed angle with no visible structures, meaning the iris apposes the trabecular meshwork completely. Grade 1 shows only Schwalbe line visible; Grade 2 shows up to the trabecular meshwork; Grade 3 shows the scleral spur; Grade 4 shows the ciliary body. A Grade 0 angle carries the highest risk of angle closure.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.