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
Aniseikonia means – 
Select and explain. 
A. Difference in the axial length of the eyeballs, B. Difference in the size of corneas, C. Difference in the size of pupils, D. Difference in the size of image formed by the two eyes
D: Difference in the size of image formed by the two eyes
Answer: D: Difference in the size of image formed by the two eyes 
Explanation: Anisoeikonia is defined as a condition wherein the images projected on the visual cortex from the two retinae are abnormally unequal in size or shape.