<prompt> Corneal transparency is maintained by:Bowmans membraneEndotheliumKeratocytesDescemets membrane  <response>: The primary mechanism controlling stromal hydration is a function of the corneal endothelium which actively pumps out theelectrolytes and water flows out passively. Endothelium consists of a single layer of flat polygonal mainly hexagonal epithelial cells misnamed as endothelium which on slit-lamp biomicroscopy appear as a mosaic. 