This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Curvature of cornea can be measured by – 
Select and explain. 
A. Keratometry, B. Direct ophthalmoscopy, C. Retino scopy, D. Perimetry
A: Keratometry
Answer: A: Keratometry 
Explanation: None