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
Which of the following accurately describe ambliopia? 
Select and explain. 
A. Color blindness, B. Myopia, C. Any detion from normal usual function of eye, D. Strabismus
C: Any detion from normal usual function of eye
Answer: C: Any detion from normal usual function of eye 
Explanation: It is paial or complete loss of sight with no ophthalmoscopic finding.