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
Visual axis is – 
Select and explain. 
A. Center of cornea to retina, B. Object to fovea, C. Center of lens to cornea, D. None
B: Object to fovea
Answer: B: Object to fovea 
Explanation: Optical axis:- Axis passing through centres of the cornea, lens to the retina.
Visual axis:- Line passing through fixation point (object) to the fovea.