Gutatta appear when hexagonal cells in this struct
Gutatta appear when hexagonal cells in this structure's endothelium self-destruct in the genetic disease Fuchs' Dystrophy.  No one is sure what it's Bowman's membrane does other than separate its largest layer from its epithelium, while that layer is separated from its endothelium by Descemet's membrane.  Recklinghausen discovered the motile corpuscles in this structure's stroma, which consists mostly of collagen.  This structure is completely avascular because it must be completely transparent to work properly, and its radius of curvature is changed in LASIK surgery.  For 10 points, name this outermost layer of the eye.
Gutatta appear when hexagonal cells in this structure's endothelium self-destruct in the genetic disease Fuchs' Dystrophy.  
cornea