All are seen in stage III trachoma except:
**Core Concept**
Trachoma is a chronic infection of the eye caused by Chlamydia trachomatis, leading to various stages of disease. Stage III trachoma is characterized by the development of significant scarring and follicular inflammation, which can lead to vision-threatening complications.
**Why the Correct Answer is Right**
In stage III trachoma, the presence of **trichiasis** is a hallmark feature. Trichiasis is a condition where eyelashes grow abnormally, rubbing against the cornea and causing discomfort, vision loss, and even blindness. This occurs due to scarring of the tarsal plates and the subsequent misdirection of eyelash growth. The scarring also leads to **entropion**, where the eyelid rolls inward, further exacerbating the problem.
**Why Each Wrong Option is Incorrect**
**Option A:** **Herbert's pits** are actually seen in stage II trachoma, where they represent areas of scarring and follicular inflammation. They are not characteristic of stage III trachoma.
**Option B:** **Lagophthalmos** is not a typical feature of stage III trachoma. Instead, it is more commonly associated with conditions like facial nerve palsy or senile ectropion.
**Option C:** **Arrested follicular inflammation** is a feature of stage II trachoma, not stage III. In stage III, the inflammation is more pronounced, leading to significant scarring.
**Clinical Pearl / High-Yield Fact**
Remember the "A-C-F" acronym to recall the stages of trachoma: **A** (arrested follicular inflammation), **C** (cicatrization), and **F** (trichiasis).
**Correct Answer: D. Lagophthalmos. Lagophthalmos**