This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Optics and refraction, Subject name: Ophthalmology
Which of the following does not effect the refraction of eye - 
Select and explain. 
A. Removal of vitreous, B. Thickening of lens, C. Increase in depth of anterior chamber, D. Change in axial length
C: Increase in depth of anterior chamber
Answer: C: Increase in depth of anterior chamber 
Explanation: Depth of anterior chamber has no role in refreactive system of eye. Refractive errors can be caused by: Eyeball length (when the eyeball grows too long or too sho) Problems with the shape of the cornea (the clear outer layer of the eye) Aging of the lens (an inner pa of the eye that is normally clear and helps the eye focus) Reference: AK khurana 7th edition