May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Investigation of Frequency Specificity of Millimeter Wave Exposure Through Ocular Temperature Measurement and Heat Transportation
M. Kojima; T. Sakai; Y. Yamashiro; Y. Suzuki; Y. Sakamoto; Y. Kawakami; S. Watanabe; M. Taki; K. Sasaki; H. Sasaki
Author Affiliations & Notes
  • M. Kojima
    Vision Res for Environmental Health, Medical Research Institute, Kanazawa Medical University, Kahoku, Japan
    School of Nursing, Kanazawa Medical University, Kahoku, Japan
  • T. Sakai
    National Institute of Information and Communications Technology, Koganei, Japan
  • Y. Yamashiro
    Vision Res for Environmental Health, Medical Research Institute, Kanazawa Medical University, Kahoku, Japan
  • Y. Suzuki
    Department of Electrical Engineering, Graduate School of Engineering, Tokyo Metropolitan University, Hachioji, Japan
  • Y. Sakamoto
    Vision Res for Environmental Health, Medical Research Institute, Kanazawa Medical University, Kahoku, Japan
    Department of Ophthalmology, Kanazawa Medical University, Kahoku, Japan
  • Y. Kawakami
    Vision Res for Environmental Health, Medical Research Institute, Kanazawa Medical University, Kahoku, Japan
    Department of Ophthalmology, Kanazawa Medical University, Kahoku, Japan
  • S. Watanabe
    National Institute of Information and Communications Technology, Koganei, Japan
  • M. Taki
    Department of Electrical Engineering, Graduate School of Engineering, Tokyo Metropolitan University, Hachioji, Japan
  • K. Sasaki
    Vision Res for Environmental Health, Medical Research Institute, Kanazawa Medical University, Kahoku, Japan
  • H. Sasaki
    Vision Res for Environmental Health, Medical Research Institute, Kanazawa Medical University, Kahoku, Japan
    Department of Ophthalmology, Kanazawa Medical University, Kahoku, Japan
  • Footnotes
    Commercial Relationships  M. Kojima, None; T. Sakai, None; Y. Yamashiro, None; Y. Suzuki, None; Y. Sakamoto, None; Y. Kawakami, None; S. Watanabe, None; M. Taki, None; K. Sasaki, None; H. Sasaki, None.
  • Footnotes
    Support  This study was supported by a safety guideline study of the Ministry of Internal Affairs and Communications of Japan.
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 2777. doi:
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      M. Kojima, T. Sakai, Y. Yamashiro, Y. Suzuki, Y. Sakamoto, Y. Kawakami, S. Watanabe, M. Taki, K. Sasaki, H. Sasaki; Investigation of Frequency Specificity of Millimeter Wave Exposure Through Ocular Temperature Measurement and Heat Transportation. Invest. Ophthalmol. Vis. Sci. 2008;49(13):2777.

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Abstract

Purpose: : Response to frequency of millimeter wave: Ocular temperature, and thermal convection in the anterior chamber.

Methods: : 0.2% micro-capsulated thermo-chromic liquid crystal was injected into the anterior chamber of pigmented rabbits. Rabbit eyes were exposed unilaterally to a 26.5, 35 or 40 GHz beams by lens antenna for 3 minutes. The maximum power density of each frequency exposed was at the surface of the corneal center. Anterior chamber slit images were recorded during exposure. Ocular temperature changes (cornea, lens) during 800 mW/cm2 exposure were measured with a Fluoroptic thermometer. The penetration depth of each frequency from the corneal surface was calculated using an electric constant of the cornea.

Results: : The calculated penetration depths of each frequency were as follows; 0.83 mm (26.5 GHz), 0.66 mm (35 GHz) and 0.59 mm (40 GHz). Mean changes of corneal and lens temperature (max. temp. - pre-exposure temp, N=5) were +1.8°C, +0.7°C (26.5 GHz); +8.7°C, +2.9°C (35GHz) and +15.5°C, +4.3°C (40 GHz) respectively. Cornea and lens temperature increased with frequency. Normal (non-exposed) aqueous humor flow was characterized by a gradual rise on the crystalline lens side and descent on the cornea side. This convection feature was reversed under exposure to 35 or 40 GHz beam (600 mW/cm2) whereas, exposure to 26.5 GHz did not show any clear convection change. The 1500 mW/cm2 exposure condition showed convection that rose on the lens side and descended on the cornea side.

Conclusions: : It was clear that ocular temperature and heat generation was affected by millimeter wave frequency.

Keywords: radiation damage: light/UV • anterior chamber • cataract 
© 2008, The Association for Research in Vision and Ophthalmology, Inc., all rights reserved. Permission to republish any abstract or part of an abstract in any form must be obtained in writing from the ARVO Office prior to publication.
Copyright © 2025 Association for Research in Vision and Ophthalmology.
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