1. Department of Optometry & Visual Science, Kulliyyah of Allied Health Sciences, International Islamic University Malaysia, Bandar Indera Mahkota, Kuantan, Pahang, Malaysia,
2. Department of Ophthalmology, Faculty of Medicine, International Islamic University Malaysia, Bandar Indera Mahkota, Kuantan, Pahang, Malaysia and
3. Department of Physiology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaacob Latif, Bandar Tun Razak, Cheras, Kuala Lumpur, Malaysia