1. Department of Ophthalmology, Kawasaki Medical School, Kurashiki, Japan
2. Department of Sensory Science, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Kurashiki, Japan
3. Division of Ophthalmology and Visual Sciences, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
4. Department of Orthoptics and Visual Sciences, Faculty of Medical Technology, Niigata University of Health and Welfare, Niigata, Japan
5. Yaoeda Eye Clinic, Nagaoka, Japan