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
Maximum refractive index ? 
Select and explain. 
A. Cornea, B. Air, C. Lens, D. Vitreous
C: Lens
Answer: C: Lens 
Explanation: Ans. is 'c' i.e., Lens Lens has maximum refractive index among the refractive structures of eye. The refractive indices of the successive layers of lens increase from the periphery towards the nucleus.