<prompt> Best to visualize corneal endotheliumFundoscopySpecular microscopySlit lamp examOperating microscopy  <response>: Ans. b Specular microscopy. Ref. Parson Diseases of Eye19thpg. l 13SPECULAR MICROSCOPY It is vital to count and study morphology of corneal endothelial cells, especially in the cases of cataract with suspected endothelial dystrophy. Normal cell count is 2000-2500 cellsmm2. IOL implantation is contraindicated if the cell count is 1500mm2. Specular reflection by slit lamp biomicroscope specular microscopy allows visualization of corneal endothelium by viewing light reflected back from this interface, count of endothelial cells is possible using an Elser grid. 