This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Anatomy
[{'content': 'Keratometer is used to assess. \nSelect and explain. \nA. Curvature of cornea, B. Diameter of cornea, C. Thickness of cornea, D. Curvature of lens', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is an objective method. Keratometer is used for: Estimate corneal astigmatism Measure the curvature of the cornea Calculate the power of intraocular lens (IOL) Image: Keratometer', 'role': 'assistant'}]