This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Errors of Refraction, Subject name: Ophthalmology
The term anisometropia indicates: 
Select and explain. 
A. Refractive error, B. Long vision, C. Short vision, D. Aging process
A: Refractive error
Answer: A: Refractive error 
Explanation: a) refractive error ref optha Nema 4th/e p.30, Khurana 3rd/e and 2nd /e p.62, parsons 19th/e p.88