1. Department of Ophthalmology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
2. Department of Ophthalmology, Gifu University Graduate School of Medicine, Gifu, Japan
3. Fukushima Eye Clinic, Osaka, Japan
4. Department of Orthoptics and Visual Sciences, Niigata University of Health and Welfare, Niigata, Japan
5. Kowa Company Ltd, Nagoya, Japan
6. The Kanto Central Hospital of the Mutual Aid Association of Public School Teachers, Tokyo, Japan