Scientists have discovered a previously unknown layer lurking in the human eye.

The newfound body part, dubbed Dua’s layer, is a skinny but tough structure measuring just 15 microns thick, where one micron is one-millionth of a meter and more than 25,000 microns equal an inch. It sits at the back of the cornea, the sensitive, transparent tissue at the very front of the human eye that helps to focus incoming light, researchers say.

Dua’s layer adds to the five previously known layers of the cornea: the corneal epithelium at the very front, followed by Bowman’s layer, the corneal stroma, Descemet’s membrane and the corneal endothelium at the very back.

More details can be found here:

http://www.livescience.com/37348-new-layer-discovered-in-human-eye.html