The tear film covers the outermost surface of the cornea and is essential to ocular «health». (cvm.ncsu.edu)
Click here to learn more Corneal Ulceration can occur when the shiny surface of the cornea is scratched or damaged. (lowchensaustralia.com)
Still, a few stem cell therapies have now been approved, such as a treatment available in India that takes stem cells from the patient's eye in order to regrow the surface of their cornea, and a US product based on other people's bone stem cells. (newscientist.com)