**Question:** Not true about Fuch's corneal dystrophy?

A. Fuchs' dystrophy is a rare disease affecting only older adults.
B. Fuchs' dystrophy is caused by genetic mutations.
C. Fuchs' dystrophy progresses rapidly and leads to severe visual impairment.
D. Fuchs' dystrophy is a self-limiting condition that resolves on its own.

**Correct Answer:** D. Fuchs' dystrophy is not self-limiting and does not resolve on its own.

**Core Concept:**
Fuchs' dystrophy is a progressive, non-inflammatory degenerative disease affecting the cornea and endothelial cells. The corneal endothelial cells are responsible for maintaining corneal clarity and preventing corneal edema. In Fuchs' dystrophy, the corneal endothelial cells lose their function, leading to corneal edema, cloudiness, and eventually visual impairment.

**Why the Correct Answer is Right:**
Fuchs' dystrophy is a chronic condition that progresses over time. Unlike Option D suggesting that it resolves on its own, Fuchs' dystrophy is a slowly progressive disease that can lead to significant visual impairment if left untreated.

**Why Each Wrong Option is Incorrect:**

A. While Fuchs' dystrophy does occur more frequently in older adults, it can also affect individuals of all ages. This option is partially correct but does not emphasize the slow progression and chronic nature of the disease.

B. Fuchs' dystrophy is not caused by genetic mutations. While the exact cause is unknown, it is believed to be related to the aging process and the accumulation of lipofuscin in the corneal endothelial cells.

C. Fuchs' dystrophy can cause corneal edema and cloudiness, but it does not progress rapidly. This option focuses on the wrong aspects of the disease and does not emphasize the slow progression and chronic nature of the disease.

**Clinical Pearl:**
Fuchs' dystrophy is a rare but important condition to recognize for clinicians as it can lead to significant visual impairment if left untreated. Early diagnosis and intervention can help manage the disease and slow its progression. Corneal transplantation may be necessary in severe cases to restore vision and prevent corneal perforation.