Koushik Tripathy1, Ravi Bypareddy2, Rohan Chawla3. 1. ICARE Eye Hospital and Postgraduate Institute, Noida, Uttar Pradesh. Electronic address: drkoushiktripathy@icarehospital.org. 2. Bangalore Medical College and Research Institute, Bengaluru, Karnataka. 3. Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India.