**Question:** Which of the following is not a feature of anterior uveitis?

A. Increased intraocular pressure
B. Conjunctival injection
C. Vitreous opacity
D. Disruption of the corneal epithelium

**Core Concept:** Anterior uveitis refers to an inflammation of the anterior uvea, which includes the iris, ciliary body, and choroid. It is a common complication of various ocular and systemic diseases.

**Why the Correct Answer is Right:** Disruption of the corneal epithelium (Option D) is a feature of corneal ulceration, not anterior uveitis. Anterior uveitis primarily affects the uveal tract, not the cornea.

**Why Each Wrong Option is Incorrect:**

A. Increased intraocular pressure (Option A) is a feature of primary angle-closure glaucoma (PACG), not anterior uveitis. Anterior uveitis typically does not result in significant elevation of intraocular pressure.

B. Conjunctival injection (Option B) is a common feature of uveitis, as it reflects the inflammatory process affecting the blood vessels in the conjunctiva.

C. Vitreous opacity (Option C) is a feature of posterior uveitis, not anterior uveitis. Anterior uveitis primarily affects the uveal tract anterior to the vitreous body, leaving the posterior segment relatively unaffected.

**Clinical Pearl:** Correctly identifying the location (anterior vs. posterior) and potential complications (e.g., glaucoma) of uveitis is crucial for appropriate diagnosis and management. Anterior uveitis is often associated with systemic diseases (e.g., tuberculosis, syphilis, or Behçet disease), while posterior uveitis is commonly linked to cytomegalovirus or herpes simplex virus infections.

**Correct Answer:** Vitreous opacity (Option C) is not a feature of anterior uveitis. This is a feature of posterior uveitis, where inflammation affects the posterior segment of the eye, including the vitreous body.