1) prepared with NGENUITY (Alcon) with a 5-second staining time with vision blue, and the fellow cornea (group  DMEK tissue preparation with 3D display system NGENUITY is feasible with a slightly increased preparation time. 
NGENUITY
2) was prepared using a OPMI Lumera 700 surgical microscope (Carl Zeiss Meditec, Jena, Germany) with a 30-second staining time. 
OPMI Lumera 700 surgical microscope