1. From the Department of Ophthalmology; Keio University School of Medicine, Tokyo, Japan; the2Department of Ophthalmology; Tokyo Dental College, Chiba, Japan; and the
2. Department of Ophthalmology; Tokyo Dental College, Chiba, Japan; and the
3. From the Department of Ophthalmology; Keio University School of Medicine, Tokyo, Japan; the
4. Department of Physiology; School of Medicine, Keio University, Tokyo, Japan.