The limbus is the repository of two populations of stem cells that are essential for vision. It contains a host of important structures such as nerves, blood vessels, melanocytes and, most importantly, two kinds of stem cells: Limbal Epithelial Stem Cells and Corneal Stromal Stem Cells. Limbal stem cells are responsible for regenerating the cornea throughout life, be that replacing cells that are lost through day to day wear and tear or by regenerating the cornea following injury.