Two weeks after an injury to his right eye, a boy presents with bilateral pain and redness. The most probable diagnosis is:
**Core Concept**
The boy's symptoms of bilateral pain and redness following an injury to his right eye are suggestive of a condition involving sympathetic overactivity. This phenomenon is known as **Horner's syndrome** in the affected eye, while the contralateral eye exhibits symptoms of **Sympathetic Ophthalmia**. Sympathetic ophthalmia is a rare, bilateral, granulomatous inflammation of the uveal tract, which is a serious complication of penetrating eye injuries.
**Why the Correct Answer is Right**
Sympathetic ophthalmia occurs due to the spread of inflammation from the injured eye to the uninjured eye through the bloodstream. This condition is often preceded by a traumatic cataract formation or retinal detachment in the injured eye. The inflammation in the uninjured eye can lead to severe vision loss if not promptly treated. The diagnosis of sympathetic ophthalmia is primarily clinical, supported by imaging studies like ultrasonography and ocular coherence tomography.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not directly related to the symptoms described in the scenario. **Vernal keratoconjunctivitis** is an allergic eye disease that typically affects children and young adults, causing symptoms like itching, photophobia, and a stringy discharge.
**Option B:** **Acute angle-closure glaucoma** is a medical emergency characterized by severe eye pain, redness, and vision loss due to increased intraocular pressure. However, it usually occurs in one eye, and the pain is typically localized to the affected eye.
**Option C:** **Iritis** is an inflammation of the iris, which can cause pain, redness, and photophobia. However, it is usually unilateral and not accompanied by the bilateral symptoms described in the scenario.
**Clinical Pearl / High-Yield Fact**
In cases of penetrating eye injuries, prompt treatment of the injured eye is crucial to prevent complications like sympathetic ophthalmia. A thorough examination and imaging studies should be performed to identify any signs of intraocular damage or inflammation.
**Correct Answer: D. Sympathetic ophthalmia**