Diagnostic test for corneal ulcer: March 2005
**Core Concept**
The diagnostic test for a corneal ulcer involves identifying the causative agent, which could be bacterial, fungal, or viral. **Corneal scraping** is a crucial procedure for obtaining a sample for further analysis.
**Why the Correct Answer is Right**
Although the specific correct answer is not provided, the most common diagnostic test for corneal ulcers involves **Gram staining** and **KOH preparation** to quickly identify bacteria and fungi, respectively.
**Why Each Wrong Option is Incorrect**
**Option A:** Without knowing the specific option, generally, any option that does not involve direct sampling or examination of the corneal tissue would be incorrect.
**Option B:** Similarly, any option that does not lead to the identification of the causative agent would be incorrect.
**Option C:** An option that suggests a non-invasive method that does not provide a direct sample for analysis might be incorrect.
**Option D:** Any option that is not a standard diagnostic procedure for corneal ulcers would be incorrect.
**Clinical Pearl / High-Yield Fact**
In clinical practice, **fluorescein staining** is also a critical tool for diagnosing corneal ulcers, as it helps visualize the defect in the corneal epithelium.
**Correct Answer:** Correct Answer: D. Fluorescein staining