Most common type of scleritis –
**Core Concept**
Scleritis is a type of inflammatory eye disease characterized by inflammation of the sclera, the white outer layer of the eyeball. It is a severe and potentially vision-threatening condition that requires prompt diagnosis and treatment.
**Why the Correct Answer is Right**
Necrotizing scleritis is the most common and severe type of scleritis, accounting for approximately 50-60% of cases. It is characterized by necrosis of the scleral tissue, leading to pain, redness, and vision loss. The exact mechanism of necrotizing scleritis is not fully understood, but it is believed to result from an autoimmune response to antigens in the sclera.
* Inflammation in necrotizing scleritis is typically diffuse and involves the entire thickness of the sclera, leading to tissue destruction.
* The condition often presents with severe eye pain, tenderness to touch, and vision loss due to scleral thinning and uveal effusion.
**Why Each Wrong Option is Incorrect**
**Option A:** Non-necrotizing scleritis is a milder form of the disease, characterized by inflammation of the sclera without tissue necrosis. While it is a common type of scleritis, it is not the most severe or common form.
**Option B:** Anterior uveitis is a type of eye inflammation that affects the anterior chamber of the eye, but it is not a type of scleritis.
**Option C:** Posterior uveitis is a type of eye inflammation that affects the posterior segment of the eye, including the retina and choroid, but it is not a type of scleritis.
**Clinical Pearl / High-Yield Fact**
It is essential to differentiate between necrotizing and non-necrotizing scleritis, as the former requires aggressive treatment to prevent vision loss and scleral perforation.
**Correct Answer:** . Necrotizing scleritis