<prompt> Corneal endothelium was seen byPachymeterKeratometerTonometerSlit lamp bio-microscope  <response>: Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 95 - 96Corneal endothelium:It consists of single layer of polygonal mainly hexagonal cellsThey are visualized by slit lamp bio-microscope and appear like a mosaicThe cell density is 30000 cellsmm2 in young adults and decreases with ageThese cells contain active pump mechanism 