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 true about keratoconus except: 
Select and explain. 
A. Increased curvature of cornea, B. Astigmatism, C. K.F. ring cornea, D. Thick cornea
D: Thick cornea
Answer: D: Thick cornea 
Explanation: Ans. Thick cornea