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
If the axial length of the eyeball is changed by limn then the power changes by: 
Select and explain. 
A. 1 dioptre, B. 2 D, C. 3 D, D. 4 D
C: 3 D
Answer: C: 3 D 
Explanation: C i.e. 3 Dioptres A decrease in 1 mm in curvature of cornea leads to hypermetropia of 6D while 1 mm decrease in length leads to hypermetropia of 3D.Q