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
[{'content': 'Most important factor determining convergence of light rays on the retina is - \nSelect and explain. \nA. Physical state of vitreous, B. Diopter power of lens, C. Curvature of cornea, D. Length of eyeball', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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:-\n\ni) Directly related to the refractive index of cornea,\nii) Inversely related to radius of curvature of cornea\nDioptric power of cornea =\xa0Refractive index of the cornea - Refractive index of air /\xa0Radius of curvature of the cornea', 'role': 'assistant'}]