The Dua classification of ocular chemical injuries was introduced to overcome limitations of the Roper-Hall system. Which parameter does it add that improves prognostic accuracy?
- A Intraocular pressure at presentation
- B Aqueous flare intensity graded on slit lamp
- C Percentage of conjunctival involvement along with clock hours of limbal involvement ✓
- D Corneal sensation measured by aesthesiometry
Correct answer: C. Percentage of conjunctival involvement along with clock hours of limbal involvement
Explanation
The Dua classification grades chemical injuries using both the clock hours of limbal involvement and the percentage of conjunctival involvement, giving six grades plus a separate category for total limbal involvement. It has better prognostic power than Roper-Hall, which uses only corneal clarity and degree of limbal ischaemia. Intraocular pressure, flare, and corneal sensation are not part of either grading system.
Reference: Parsons' Diseases of the Eye, 23rd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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