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
Most important factor determining convergence of light rays on the retina is - 
Select and explain. 
A. Physical state of vitreous, B. Diopter power of lens, C. Curvature of cornea, D. Length of eyeball
C: Curvature of cornea
Answer: C: Curvature of cornea 
Explanation: It has already been explained that most important refractive structure of the eye is cornea with a dioptric power of 44. The dioptric power of the cornea is dependent on two factors:-

i) Directly related to the refractive index of cornea,
ii) Inversely related to radius of curvature of cornea
Dioptric power of cornea = Refractive index of the cornea - Refractive index of air / Radius of curvature of the cornea