Graduated from Fukushima Medical University School of Medicine in 1983.
1993: Studied at the University of California, Berkeley (as a researcher).
In 2003, he became a part-time lecturer at Fukushima Medical University and the director of Kajita Eye Clinic.
Currently, he is a Clinical Professor at the Faculty of Medicine, Tokyo Medical and Dental University, a Director of the Japanese Society of Ophthalmic Optics, a Director of the Japanese Contact Lens Society, a Councilor of the Japanese Society of Ophthalmology, a part-time lecturer in ophthalmology at Fukushima Medical University, a coordinator of the Refractive Accommodation Research Group, and a coordinator of the Chronic Fatigue Syndrome Research Group.