Amniotic membrane acts like a basement membrane and facilitates the migration of epithelial cells.4 It reinforces adhesion of basal epithelial cells, promotes epithelial differentiation, prevents epithelial apoptosis, and improves corneal sensitivity and tear film stability,5 although the exact mechanism is not known. It also produces growth factors that promote epithelial cell growth.6 It is believed to expand and maintain epithelial progenitor cells ex vivo.7