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': 'Which of the following does not effect the refraction of eye \nSelect and explain. \nA. Removal of vitreous, B. Thickening of lens, C. Increase in depth of anterior chamber, D. Change in axial length', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer- C. Increase in depth of anterior chamberDepth of anterior chamber has no role in refractive system of eye.Removal of vitreous will change the refractionThickening of lens will change the refractionChange in axial length has a large effect on refractive power of eye.The main function of refractive system of eye is to focus the light rays on the retina.', 'role': 'assistant'}]