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: Intraocular lesn power calculation:- Which requires Keratometry (K), Axial length of eyeball or Biometry (L) and a constant (A). It is calculated SRK formula :- (Ref: Yanoff; Jay S. Duker 2009 Ophthalmology 3rd/e p.416-419)