<prompt> All of the following are true about layers of cornea except :Predescemets layer is also known sd Duas layerType 2 type 4 type of collagen are present in Descement membraneCorneal Stroma is the thickest layer of the corneaEndothelium is responsible for maintaining relatively dehydrated state of cornea  <response>: Descement membrane: toughest layer of cornea Descements Membrane : Act as a basement membrane for the endothelial cells Type 4 type 8 are most common type of collagen in DM Toughest layer that provides protection from perforation Responsible for descemetocele formation. Site of deposition of copper as KF ring in wilsons disease . If dua layer is in option then go for that Endothelium is responsible for behaving like a pump that maintains the relatively dehydrated state of the cornea thereby maintaining its transparency The other options are all true 