<prompt> Which of the following is best to study corneal endothelium?FoundoscopySpecular microscopySlit lamp examOperating microsopy  <response>: Ans. b Specular microscopy. Ref. Parson Diseases of Eye, 19th ed., 113SPECULAR 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. 