Pawan Prasher1,2, Brahmjot Singh3, Kanwardeep Singh4. 1. Department of Ophthalmology, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, Punjab, India. 2. Department of Ophthalmology, Amritsar Eye Hospital, Amritsar, Punjab, India. 3. Department of Pharmaceutical Sciences, Guru Nanak Dev University, Amritsar, Punjab, India. 4. Department of Microbiology, Government Medical College, Amritsar, Punjab, India.