Salt and pepper fundus occurs in
**Core Concept**
Salt and pepper fundus refers to a condition characterized by multiple, scattered, small, white or black spots on the retina, resembling salt and pepper. This condition is often associated with retinal pigment epithelium (RPE) changes and can be a sign of various underlying diseases, including retinal dystrophies and age-related macular degeneration.
**Why the Correct Answer is Right**
The "salt and pepper" appearance is due to the presence of small, scattered areas of retinal pigment epithelium (RPE) atrophy and hyperplasia. This can be caused by a variety of factors, including retinal dystrophies, age-related macular degeneration, and other conditions that affect the RPE. The RPE plays a crucial role in maintaining the health of the retina, and damage to this layer can lead to visual impairment.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a known cause of salt and pepper fundus.
* **Option B:** This condition is more commonly associated with a "bull's eye" maculopathy, not a salt and pepper appearance.
* **Option C:** While this condition can affect the retina, it is not typically associated with a salt and pepper fundus.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that a salt and pepper fundus can be a sign of underlying systemic or retinal disease, and further evaluation is necessary to determine the cause.
**Correct Answer: C. Choroideremia.**