Exposure duration: up to 100 min
|power density||150 mW/cm²||unspecified||measured||-||maximum SAR= 138 W/kg applied for 100 min|
|power density||300 mW/cm²||unspecified||measured||-||SAR= 270 W/kg for 30-35 min exposure|
|power density||200 mW/cm²||unspecified||measured||-||SAR = 180 W/kg for 35-40 min exposure|
|power density||1,000 W/m²||unspecified||measured||-||SAR= 90 W/kg; applied for 60 min|
The main attention was to define a thermal threshold for cataractogenic microwave effects. After irradiation irreversible damage were only observed in the posterior cortical area of the eye lens. The minimum cataractogenic power density was 150 mW/cm2 for 100 min, which correspond to an SAR value of 138 W/kg in the vitreous body.
The study revealed a possible threshold temperature around 41°C. Furthermore the eye lens seems to be the most critical part of the eye to microwave irradiation. The findings of this study point to a thermal mechanism responsible for the observed microwave effects. However, the possibility of nonthermal effects of microwave radiation on eye should not easily rejected.