Does wearing of contact lens exacerbate millimeter wave exposure induced ocular disorder?

• Project/Area Number: 15K12209
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Risk sciences of radiation and chemicals
• Research Institution: Kanazawa Medical University
• Principal Investigator: KOJIMA Masami 金沢医科大学, 看護学部, 教授 (40183339)
• Co-Investigator(Renkei-kenkyūsha): SUZUKI Yukihisa 首都大学東京, システムデザイン研究科・電子情報システム工学域, 教授 (30336515) ; SASAKI Kensuke 国立研究開発法人・情報通信研究機構, 電磁波計測研究所電磁環境研究室, 研究員 (60614401) ; OKUNO Tsutomu 独立行政法人労働安全衛生総合研究所, 人間工学・リスク管理研究グループ, 部長 (90332395) ; SASAKI Hiroshi 金沢医科大学, 医学部, 教授 (60260840)
• Research Collaborator: ISHIBA Yoshihisa 山本光学株式会社, ビジョンケア・光研究所, 所長
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: コンタクトレンズ / カラーコンタクトレンズ / ミリ波 / 感温液晶カプセル / 眼内熱輸送の可視化 / 外眼部熱蒸散の可視化 / 外眼部熱輸送の可視化 / テラヘルツタイムドメイン分光計 / ミリ波曝露 / 眼障害 / ソフトコンタクトレンズ / 熱輸送遅延作用 / 外眼部対流 / 眼内部対流

Outline of Final Research Achievements

As a result of examining the effect of wearing a contact lens (CL) by visualizing the heat transport in the eye by injecting a thermo-sensitive liquid crystal capsule (fine particles changing color by heat) into the eye, CL wearing showed shomewhat the effects of reducing corneal temperature elevation. We investigated the absorption characteristics of millimeter waves (MMW) using Terahertz time-domain transmission spectrometer for color CL (metal paint may absorb MMW), but there was no significant MMW absorption by color CL.As a result of visualizing the transpiration state of the heat to the outer eye part during exposure to millimeter waves (MMW) by creating a chamber that fits the outer eye part of rabbits, CL wearing had no clear effects of suppress or reduce of ocular damage.

Research Products

• [Journal Article] Ocular effects of exposure to 40, 75, and 95 GHz millimeter waves (2018)
  • Author(s): M. Kojima, Y. Suzuki, K. Sasaki, M. Taki, K. Wake, S. Watanabe, M. Mizuno, T. Tasaki, H. Sasaki
  • Journal Title: Journal of Infrared, Millimeter, and Terahertz Waves Volume: 印刷中
  • Peer Reviewed / Open Access
• [Presentation] ジャイロトロンを利用したテラヘルツ波曝露による眼障害発生閾値探索の試み (2018)
  • Author(s): 小島 正美、鈴木 敬久、田崎 隆史、佐々木 洋
  • Organizer: 金沢医科大学総合医学研究所 平成29年度研究セミナー
• [Presentation] Microwave Radiation Cataract (2017)
  • Author(s): Masami Kojima, Yukihisa Suzuki, Kensuke Sasaki, Hiroshi Sasaki
  • Organizer: The 5th International Conference on the Lens (ICL)
  • Int'l Joint Research / Invited
• [Presentation] Investigation on corneal epithelium damage thresholds by CEM43°C criterion due to millimeter-wave electromagnetic field exposure (2016)
  • Author(s): Yukihisa Suzuki, Masami Kojima, Jerdvisanop Chakarothai, Kensuke Sasaki, Masao Taki, Hiroshi Sasaki
  • Organizer: ARVO
  • Place of Presentation: Seattle, U.S.A.
  • Year and Date: 2016-05-01
  • Int'l Joint Research
• [Presentation] ミリ波曝露による眼外部の熱動態のシミュレーションの試み (2016)
  • Author(s): 小島 正美、 鈴木 敬久、佐々木 一之 、佐々木 洋
  • Organizer: 金沢医科大学総合医学研究所セミナー
  • Place of Presentation: 金沢医科大学基礎研究棟２階会議室（石川県河北郡内灘町）
  • Year and Date: 2016-02-12