In Chandler Index denominator used is
**Core Concept**
The Chandler Index is a clinical tool used to assess the severity of corneal ulcers. It quantifies the extent of corneal infiltrates and the presence of hypopyon, which is an accumulation of pus or leukocytes in the anterior chamber of the eye.
**Why the Correct Answer is Right**
The Chandler Index is calculated based on the presence and extent of corneal infiltrates and the presence of hypopyon. The index is a simple and useful tool for clinicians to assess the severity of corneal ulcers and guide management. The presence of hypopyon is a critical factor in the Chandler Index, as it indicates a more severe infection.
**Why Each Wrong Option is Incorrect**
**Option A:** This is not correct, as the Chandler Index does not use the number of days since the onset of symptoms as its denominator.
**Option B:** This is not correct, as the Chandler Index does not use the total number of corneal infiltrates as its denominator.
**Option C:** This is not correct, as the Chandler Index does not use the diameter of the ulcer as its denominator.
**Clinical Pearl / High-Yield Fact**
The Chandler Index is a simple and useful tool for clinicians to assess the severity of corneal ulcers. It is essential to remember that the presence of hypopyon is a critical factor in the Chandler Index, indicating a more severe infection.
**Correct Answer: C. Total number of corneal infiltrates.