Pradeep Sharma1, Shweta Chaurasia2, Abhijit Rasal1, Dewang Angmo1. 1. Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India. 2. Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India. Electronic address: shweta84omns@yahoo.com.