This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea, Subject name: Ophthalmology
[{'content': 'Best to visualize corneal endothelium \nSelect and explain. \nA. Fundoscopy, B. Specular microscopy, C. Slit lamp exam, D. Operating microscopy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b (Specular microscopy). (Ref. Parson Diseases of Eye/19th/pg. l 13)SPECULAR 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 cells/mm2.# IOL implantation is contraindicated if the cell count is < 1500/mm2.# 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.', 'role': 'assistant'}]