## **Core Concept**
Sarcoidosis is a systemic granulomatous disease that can affect multiple organs, including the eyes. Ocular involvement in sarcoidosis can manifest in various forms, ranging from mild to severe. The condition often presents with granulomatous inflammation.

## **Why the Correct Answer is Right**
The most common ocular manifestation of sarcoidosis is **uveitis**, particularly **posterior uveitis** and **panuveitis**. Uveitis in sarcoidosis is characterized by the presence of non-caseating granulomas in the uveal tract. This condition can lead to symptoms such as blurred vision, eye pain, and sensitivity to light. The involvement of the uvea, which includes the iris, ciliary body, and choroid, is a hallmark of sarcoidosis.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While conjunctivitis can be a manifestation of sarcoidosis, it is not the most common ocular involvement. Conjunctival involvement usually presents as conjunctival nodules or follicles.
- **Option B:** Optic neuritis can occur in sarcoidosis but is less common compared to uveitis. It presents as inflammation of the optic nerve, leading to visual disturbances.
- **Option C:** (No option provided, assuming a placeholder)
- **Option D:** Other ocular manifestations like lacrimal gland involvement, orbital masses, and retinal vasculitis can occur but are less common than uveitis.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that sarcoidosis can cause **bilateral hilar lymphadenopathy** and **eye involvement**, and it's one of the few conditions that can cause **hypercalcemia** due to increased vitamin D production by activated macrophages within granulomas. Remember, ocular sarcoidosis can be a significant cause of morbidity, and early diagnosis and treatment are crucial.

## **Correct Answer:** B. uveitis