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
Minimum vision loss with which cataract – 
Select and explain. 
A. Blue dot cataract, B. Zonular cataract, C. Anterior polar cataract, D. Posterior polar cataract
A: Blue dot cataract
Answer: A: Blue dot cataract 
Explanation: In blue dot cataract, opacities are usually stationary and do not affect vision.