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 impoant factor determining convergence of light rays on 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: C i.e. Curvature of cornea Curvature of cornea is most impoant factor determining convergence of light rays on retina Q and refractory power of eye Q. Cornea is the most impoant refractive surface of the eye. The total diopteric power of eye is about + 60 D Q, out of which + 44 D is contributed by cornea and +16 D by the lens Q. Also, 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.', 'role': 'assistant'}]