## Roper Hall Classification of Chemical Eye Injuries The Roper Hall grading system is the most widely used classification for chemical injuries of the eye, based on corneal and conjunctival involvement at the time of presentation. ### Roper Hall Grading System | Grade | Corneal Opacity | Conjunctival Ischemia | Limbal Ischemia | Prognosis | |-------|-----------------|----------------------|-----------------|----------| | **1** | Cornea clear, details visible | None | None | Excellent | | **2** | Cornea hazy, iris details visible | < 1/3 of conjunctiva | None | Good | | **3** | Cornea opaque, iris details obscured | 1/3 to 1/2 of conjunctiva | < 1/3 of limbus | Guarded | | **4** | Cornea opaque, pupil not visible | > 1/2 of conjunctiva | > 1/3 of limbus | Poor | **Key Point:** Grade 3 injuries show partial conjunctival ischemia (1/3 to 1/2) and limited limbal ischemia (< 1/3), with corneal opacity that obscures iris details but allows some light perception. The prognosis is **guarded** — vision may be recovered with aggressive management, but complications are common. **High-Yield:** - **Grade 1–2**: Usually heal well with medical management alone - **Grade 3**: Requires intensive treatment; limbal stem cell transplantation may be needed - **Grade 4**: Very poor prognosis; often leads to blindness despite aggressive therapy **Mnemonic: CLIC** — **C**ornea, **L**imbal ischemia, **I**ris details, **C**onjunctival ischemia (the four parameters assessed in Roper Hall) **Clinical Pearl:** The presence of limbal ischemia is a critical prognostic indicator because the limbus contains stem cells essential for corneal epithelial regeneration. Extensive limbal damage (Grade 4) results in conjunctivalization of the cornea and permanent blindness. 
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