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
All are causes of night blindness except: 
Select and explain. 
A. Vitamin A deficiency, B. Oguchi disease, C. Myopia, D. Devics disease
D: Devics disease
Answer: D: Devics disease 
Explanation: Devics disease