This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Elementary Optics, Subject name: Ophthalmology
Aniseikonia means - 
Select and explain. 
A. Difference in the axial length of the eyeballs, B. Difference in the size of cornea in both eyes, C. Difference in the size of pupil in both eyes, 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: Ans. (d) Difference in the size of image formed by the two eyesRef: Parsons 22/e, p. 283, 613Aniseikonia is defined as a condition where the images projected on the visual cortex from the two retinae are abnormally unequal in size or shape.