Department of Ophthalmology, Government Medical College and Hospital, Sector32, Chandigarh, 160031, India. Department of Ophthalmology, Government Medical College and Hospital, Sector32, Chandigarh, 160031, India. subina_navya@yahoo.com. Department of Neonatology, Government Medical College and Hospital, Sector32, Chandigarh, 160031, India. Department of Biochemistry, Government Medical College and Hospital, Sector32, Chandigarh, 160031, India. Department of Ophthalmology, Post Graduate Institute of Medical Education and Research, Sector 12, Chandigarh, 160012, India.