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
Anisometropia means- 
Select and explain. 
A. Difference in corneal curvature in both meridian, B. High difference of refractive error between the two eye, C. Subluxation of one of the lens, D. Difference in image size of 2% in both eyes
B: High difference of refractive error between the two eye
Answer: B: High difference of refractive error between the two eye 
Explanation: Ans. (b) High difference of refractive error between the two eyeRef: Parson's 22/e, p. 78Anisometropia is term used when dioptric power of both eyes are not the same, significant if >2.5D difference.