**Stage III Trachoma**

**Core Concept**
Trachoma is a chronic keratoconjunctivitis caused by Chlamydia trachomatis, leading to scarring and vision loss. Stage III trachoma involves the formation of cicatricial changes, including entropion, trichiasis, and corneal scarring.

**Why the Correct Answer is Right**
In stage III trachoma, the hallmark features are the result of chronic inflammation and scarring. Entropion (inward turning of the eyelid margin) and trichiasis (abnormal growth of eyelashes) lead to corneal damage and vision loss. However, stage III trachoma is characterized by the absence of active inflammation and the presence of cicatricial changes.

**Why Each Wrong Option is Incorrect**
* **Option A:** Trachoma follicles are typically seen in stage I and II, but not in stage III. They represent an active inflammatory response.
* **Option B:** Herbert's pits are characteristic of stage III trachoma, representing corneal scarring. However, the question asks for features not seen in stage III.
* **Option C:** Limbal vascularization is a feature of active trachoma (stage I and II), indicating inflammation and active infection.

**Clinical Pearl / High-Yield Fact**
Remember that trachoma progresses through stages I to III, with stage III representing cicatricial changes and scarring. Early recognition and treatment are crucial to prevent long-term vision loss.

**Correct Answer: A. Trachoma follicles.**