## **Core Concept**
Reis-Bückler dystrophy is a rare, inherited corneal disorder that affects the **corneal epithelium** and **Bowman's layer**. It is characterized by a progressive loss of vision due to corneal opacification and irregularities in the corneal surface.

## **Why the Correct Answer is Right**
The correct answer, **Bowman's layer**, is the layer primarily affected in Reis-Bückler dystrophy. This dystrophy is known for its specific involvement of Bowman's layer, leading to its disruption and replacement by irregular, fibrotic tissue. The corneal epithelium is also affected, but the hallmark is the changes in Bowman's layer.

## **Why Each Wrong Option is Incorrect**
- **Option A:** The **endothelium** is not the primary layer affected in Reis-Bückler dystrophy. The endothelium is involved in other types of corneal dystrophies, such as Fuchs' endothelial dystrophy.
- **Option C:** The **stroma** is not specifically targeted in Reis-Bückler dystrophy, although secondary changes might occur due to the primary involvement of other layers.
- **Option D:** The **Descemet's membrane** is not primarily affected in Reis-Bückler dystrophy. Changes in Descemet's membrane are more characteristic of other corneal conditions.

## **Clinical Pearl / High-Yield Fact**
A key clinical feature of Reis-Bückler dystrophy is the presence of **reticular (net-like) corneal epithelial edema** and **opacification** primarily due to the involvement of Bowman's layer. This condition often presents in childhood or adolescence with symptoms of photophobia, tearing, and progressive vision loss.

## **Correct Answer:** . Bowman's layer