Open Access
Photochemistry and Photobiology

  • Published: May 3, 2022

One-year Ocular Safety Observation of Workers and Estimations of Microorganism Inactivation Efficacy in the Room Irradiated with 222-nm Far Ultraviolet-C Lamps



Kazunobu Sugihara 1, Sachiko Kaidzu 1, Masahiro Sasaki 2, Sho Ichioka 1, Yuji Takayanagi 1, Hiroshi Shimizu 1

Ichiya Sano 1, Katsunori Hara 1, Masaki Tanito 1 


1 Department of Ophthalmology, Shimane University Faculty of Medicine, Izumo, Japan. 

2 Ushio Inc., Tokyo, Japan. 



Observations and research on the safety of 222 nm Far UV-C on the eye. The eyes of health care workers regularly working in a clinic were observed for one year before and after the installation of a unit (Ushio) equipped with Far UV-C disinfection technology with Care222® filters. Results showed no acute or chronic adverse effects. 
Microbial inactivation studies were conducted in the clinics where the observations and studies were conducted. Results showed 90% inactivation of Staphylococcus aureus and 99% inactivation of φX174 phage. 

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