Human eye. Source
This new discovery is game changing. A researcher, Dr. Harminder Dua from the University of Nottingham, has discovered a new layer in the human cornea, the transparent tissue in front of the eye that focuses light. Previously, doctors and scientist only knew of five layers in the cornea, and it's no surprise that they didn't find this sixth layer, considering that it is only 15 microns thick (less than 3/5,000 of an inch). Apart form meaning that someone will literally have to rewrite the text books, this new discovery will also help in the treatment of disease. Already one disease, keratoconus, has been associated with a tear in this layer. Hopefully we'll see some impressive medical advances due to this discovery.