Endothelial keratoplasty (EK) is a corneal transplant procedure that involves replacing only the inner layer of the cornea, the endothelial layer, rather than the entire cornea. This procedure is used to treat conditions such as Fuchs' dystrophy or other endothelial cell disorders that lead to corneal swelling and vision problems.

EK is a minimally invasive procedure, requiring a small incision to remove the damaged endothelial cells and replace them with healthy donor tissue. This method preserves more of the patient's natural cornea and allows for faster recovery compared to full-thickness corneal transplants.

Endothelial keratoplasty can significantly improve vision and reduce the risk of complications associated with more invasive corneal transplant techniques.