This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy, Development and clinical examination, Subject name: Ophthalmology
Corneal endothelial cell count is measured by 
Select and explain. 
A. Specular microscope, B. Ophthalmoscope, C. Synoptophore, D. Amsler's grid
A: Specular microscope
Answer: A: Specular microscope 
Explanation: Corneal endothelium is examined with a specular microscope, Which allows a clear morphological study of endothelial cells including photographic documentation The cell density of endothelium is around 3000 cells/mm2 in young adults, which decreases with advancing age. Image : Specular microscopy Reference : AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 95 - 96