The Werner classification (NOSPECS) of thyroid orbitopathy grades orbital involvement from 0 to 6. Which class corresponds to exposure keratopathy due to incomplete lid closure?
- A Class 2 ✓
- B Class 3
- C Class 4
- D Class 5
Correct answer: A. Class 2
Explanation
NOSPECS: 0 = No signs/symptoms; 1 = Only signs (lid retraction, lag); 2 = Soft tissue involvement (periorbital oedema); 3 = Proptosis; 4 = EOM involvement; 5 = Corneal involvement (exposure keratopathy due to lagophthalmos); 6 = Sight loss (optic nerve compression). Class 5 corresponds to corneal/exposure changes. Class 2 is soft tissue; class 4 is extraocular muscle restriction.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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