A newer classification of ocular chemical injuries grades severity using clock hours of limbal involvement plus percentage of conjunctival involvement, rather than corneal clarity alone. This classification, which better predicts final visual outcome than Roper-Hall, is:

• A Dua classification ✓
• B Ballantyne classification
• C Hughes classification
• D Thygeson classification

Explanation

The Dua classification grades chemical burns by clock hours of limbal involvement and percentage conjunctival involvement, giving six grades plus a special category 'E' for total surface loss. It has been shown to predict prognosis more accurately than Roper-Hall because it quantifies limbal stem cell loss directly. Hughes described a proptosis-repair procedure, not a burn classification, and Thygeson classified superficial corneal dystrophies.

Reference: Parsons' Diseases of the Eye, 23rd ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.