## **Core Concept**
Non-sterile hypopyon refers to the accumulation of pus or infectious material in the anterior chamber of the eye. This condition is often associated with severe ocular inflammation or infection. It is crucial to distinguish between sterile and non-sterile hypopyon, as their management and prognosis differ significantly.

## **Why the Correct Answer is Right**
The correct answer, endophthalmitis, is a severe inflammation of the interior of the eye, usually caused by an infection. Non-sterile hypopyon is a hallmark of endophthalmitis, which can lead to rapid vision loss if not promptly treated. Endophthalmitis can occur after cataract surgery, penetrating ocular trauma, or as a result of an endogenous infection.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Uveitis is inflammation of the uvea, which can cause a sterile hypopyon. While uveitis can lead to significant ocular morbidity, it is not typically associated with a non-sterile hypopyon.
- **Option B:** Corneal ulcer can lead to endophthalmitis if the infection spreads to the interior of the eye, but the condition itself is not characterized by non-sterile hypopyon.
- **Option C:** This option is not provided, but based on the correct answer being endophthalmitis, any other condition not directly related to an infectious process within the eye would be incorrect.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that non-sterile hypopyon is an ocular emergency, often requiring immediate intervention, including intravitreal antibiotics or antifungal agents, and sometimes vitrectomy. Recognizing the condition promptly is critical for preserving vision.

## **Correct Answer:** D. Endophthalmitis.