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Masami Kojima, Hiroshi Sasaki, Kazuyuki Sasaki, Nailia Hasanova, Yukihisa Suzuki, Masao Taki, Kensuke Sasaki, Kanako Wake, Soichi Watanabe, Millimeter wave study group; Study of Acute Ocular Damage Threshold of 40 GHz Millimeter Wave. Invest. Ophthalmol. Vis. Sci. 2012;53(14):3571.
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© ARVO (1962-2015); The Authors (2016-present)
Millimeter wave bands (MMW) are increasingly used in various wireless communications in daily life. We previously developed an experimental model to examine the effect of 60 GHz exposure to the eye [Kojima et al., Health Physics, 2009]. Here we study the acute ocular damage threshold of 40 GHz millimeter wave.
Pigmented rabbits (N= 21, Dutch, 14-15 week-old) were exposed unilaterally to 400, 300 and 200 mW/cm2 40 GHz MMW for 6 minutes by a lens antenna. Medetomidine hydrochloride (0.5 mg/kg) was injected intramuscularly for systemic anaesthesia during MMW exposure and ocular examination. Ocular changes were evaluated by slit-lamp biomicroscopy. Corneal surface temperature during MMW exposure was measured by a thermograph camera.
The highest corneal surface temperature during MMW exposure was seen at 400 mW/cm2 (46.0±1.2ºC), followed by 300 mW/cm2 (42.8±0.6ºC) and 200 mW/cm2 (41.6±0.1ºC). Miosis and corneal epithelial damage except corneal stromal opacification were observed immediately after 6 min exposure to 400 mW/cm2. Corneal stromal opacification and corneal epithelial damage occurred from 1 to 2 days after exposure. No miosis, but slight corneal epithelial damage was induced immediately after 6 min exposure to 300 mWc/m2. This slight epithelial damage healed within 24 hours. No ocular changes were seen in the 200 mW/cm2 exposure group from immediately after to 2 days after exposure upon slit-lamp examination.
Acute ocular damage threshold of 40 GHz millimeter exposure (MMW) was investigated using in vivo rabbit model. Six-minute exposure to 40 GHz 200 mW/m2 did not induce any detectable ocular tissue damage.
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