A new classification of ocular surface chemical burns grades injury based on the extent of conjunctival involvement and limbal involvement measured in clock hours. This classification, which better predicts outcome than Roper-Hall in severe burns, is:
- A Dua classification ✓
- B Ballantyne classification
- C Duke-Elder classification
- D McCoy classification
Correct answer: A. Dua classification
Explanation
The Dua classification quantifies limbal involvement in clock hours and conjunctival involvement as percentage of bulbar conjunctiva. It was designed to grade limbal stem cell deficiency more precisely than Roper-Hall, which uses only corneal haze and limbal ischaemia in quarters. Ballantyne and Duke-Elder are not chemical burn grading systems, which kills those distractors.
Reference: Parsons' Diseases of the Eye, 23rd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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