This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Squint, Subject name: Ophthalmology
Modified Kastenbaum surgery is done for 
Select and explain. 
A. Esotropia, B. Nystagmus, C. Superior oblique palsy, D. Third nerve palsy
B: Nystagmus
Answer: B: Nystagmus 
Explanation: Modified Kastenbaum Surgery *Recession resection of all four horizontal recti is done according to the type and amount of nystagmus