Fuchs dystrophy is characterized by damage to which corneal layer, interrupting nutrient exchange?

Fuchs dystrophy is characterized by damage to which corneal layer, interrupting nutrient exchange?

• A. Corneal epithelium
• B. Stroma
• C. Endothelium
• D. Descemet's membrane

Answer: (D)

Fuchs dystrophy primarily involves dysfunction of the corneal endothelium, the single-cell-thick layer lining the inside of the cornea that keeps the stroma dehydrated. The endothelial pumps actively move fluid out of the stroma into the anterior chamber; when endothelial cells are lost or fail, this pumping decreases, allowing fluid to accumulate in the stroma (and sometimes the epithelium). This edema disrupts corneal transparency and nutrient balance, leading to vision problems. Descemet's membrane is the basement membrane produced by the endothelium. In Fuchs you often see changes such as guttae and thickening of Descemet's membrane, which reflect the endothelial pathology, but the functional wreckage that interrupts nutrient exchange and causes edema is the endothelial cell layer itself. On imaging like OCT, you’d look for increased central corneal thickness and posterior edema, with Descemet's membrane changes accompanying the process.

Fuchs dystrophy primarily involves dysfunction of the corneal endothelium, the single-cell-thick layer lining the inside of the cornea that keeps the stroma dehydrated. The endothelial pumps actively move fluid out of the stroma into the anterior chamber; when endothelial cells are lost or fail, this pumping decreases, allowing fluid to accumulate in the stroma (and sometimes the epithelium). This edema disrupts corneal transparency and nutrient balance, leading to vision problems.

Descemet's membrane is the basement membrane produced by the endothelium. In Fuchs you often see changes such as guttae and thickening of Descemet's membrane, which reflect the endothelial pathology, but the functional wreckage that interrupts nutrient exchange and causes edema is the endothelial cell layer itself. On imaging like OCT, you’d look for increased central corneal thickness and posterior edema, with Descemet's membrane changes accompanying the process.