**Question:** In sympathetic ophthalmia, the first sign is -

A. Conjunctival injection
B. Anterior uveitis
C. Posterior uveitis
D. Retinal detachment

**Core Concept:** Sympathetic ophthalmia is a rare and severe inflammatory disorder that occurs when the immune system mistakenly attacks the eye following an ocular trauma or surgery involving the choroid, the middle layer of the eye containing blood vessels. In sympathetic ophthalmopathy, the immune response targets the eye after an insult to the sympathetic nervous system, leading to inflammation and damage to the structures of the eye.

**Why the Correct Answer is Right:** The first sign of sympathetic ophthalmopathy is **B. Anterior uveitis**. Anterior uveitis is inflammation of the middle layer of the eye, known as the uveal tract, which includes the iris, ciliary body, and choroid. Anterior uveitis leads to symptoms like redness, pain, and blurred vision.

**Why Each Wrong Option is Incorrect:**

**Option A (Conjunctival injection)**: While conjunctival injection can occur in various eye conditions, it is not the primary presenting symptom of sympathetic ophthalmopathy. Anterior uveitis is the primary indicator of this condition.

**Option C (Posterior uveitis)**: Posterior uveitis refers to inflammation in the posterior part of the eye, involving the retina, optic nerve, and macula. This is different from the initial anterior uveitis observed in sympathetic ophthalmopathy.

**Option D (Retinal detachment)**: Retinal detachment is a late complication of sympathetic ophthalmopathy and is not the primary presenting symptom. Anterior uveitis is the main indicator of this condition.

**Clinical Pearl**: Sympathetic ophthalmopathy is a severe and potentially sight-threatening condition, so it is essential for healthcare professionals to be aware of the typical initial symptoms, such as anterior uveitis. Early diagnosis and treatment can prevent severe complications and protect vision.