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: Unknown
The thickness of the cornea is best detected by- 
Select and explain. 
A. Keratometry, B. Pachymetry, C. Placido disc, D. Tonometry
B: Pachymetry
Answer: B: Pachymetry 
Explanation: Ans. (b) PachymetryRef: A.K. Khurana 6th ed. 195-96, Khurana 4th ed./89* Corneal thickness is measured by the method known as pachymetry. Normal corneal thickness is around (0.52 mm - 0.7 mm) 500 - 700 pm.Also Know* PLACIDO DISC- for corneal surface* Keratometry- Corneal curvature* Tonometry- for IOP