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
KISA% is associated with 
Select and explain. 
A. Keratoconus, B. Keratoglobus, C. Hypermetropia with astigmatism, D. Terrien's marginal degeneration
A: Keratoconus
Answer: A: Keratoconus 
Explanation: Answer- A. KeratoconusThe KISA index is used in cases ofkeratoconus and is derived using 4 indices:Central keratometry KInferior- Superior keratometry (I-S)Astigmatism Index (AST)