This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
SRK formula is used to calculate- 
Select and explain. 
A. Power of intraocular lens, B. Corneal curvature, C. Corneal endothelial cell count, D. Extent of retinal detachment
A: Power of intraocular lens
Answer: A: Power of intraocular lens 
Explanation: Ans. is 'a' i.e., Power of intraocular lens SRK formula* Power of IOL = A - 2.5L -0.9K* L is axial length of the eyeball in mm* A is IOL specific constant* K is average corneal refractive power