**Core Concept**
Sympathetic ophthalmitis is a rare, bilateral granulomatous inflammation of the uvea that occurs after penetrating eye injury or surgery, often in one eye. It is an autoimmune response triggered by the introduction of uveal antigens into the immune system.

**Why the Correct Answer is Right**
Sympathetic ophthalmitis is a type of autoimmune response that involves the activation of T lymphocytes and the release of various cytokines and chemokines, leading to a granulomatous inflammation of the uvea. The condition is often associated with the presence of uveal melanocytes and the expression of major histocompatibility complex (MHC) class II molecules on the surface of antigen-presenting cells. This leads to the activation of autoreactive T cells that recognize the uveal antigens as foreign, resulting in an immune response against the unaffected eye.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because sympathetic ophthalmitis is not typically associated with a viral etiology. The condition is thought to be an autoimmune response rather than an infectious process.

**Option B:** This option is incorrect because sympathetic ophthalmitis is not typically characterized by a rapid onset of symptoms. The condition often develops weeks to months after the initial injury or surgery, and the symptoms may be insidious in onset.

**Option C:** This option is incorrect because sympathetic ophthalmitis is not typically associated with a significant increase in intraocular pressure. The condition is often characterized by a decrease in intraocular pressure due to the inflammatory response.

**Option D:** This option is incorrect because sympathetic ophthalmitis is not typically treated with corticosteroids alone. While corticosteroids may be used to reduce inflammation, the condition often requires more aggressive immunosuppressive therapy, including the use of immunomodulatory agents.

**Clinical Pearl / High-Yield Fact**
Sympathetic ophthalmitis is a rare but potentially devastating condition that can occur after penetrating eye injury or surgery. It is essential for ophthalmologists and other healthcare providers to be aware of the condition and to take steps to prevent it, such as using sterile technique and avoiding the use of contaminated instruments.

**Correct Answer: D.**