Electromagnetic fields in smart glasses
One of the questions we often hear is: “What about the radiation from the smart glasses?” It’s a reasonable question. After all, data transmission via WLAN or Bluetooth does not happen by magic. In this issue of Headstarter, we’ll address concerns and bust some myths!
Experts differentiate between ionizing radiation and non-ionizing radiation such as that created by cellphones and WLAN. Authorities and institutions assess the potential dangers posed by these two types of radiation. In Germany, this is handled by the Federal Office for Radiation Protection (Bundesamt für Strahlenschutz) and at international level by the International Commission on Non-Ionizing Radiation Protection (ICNIRP).
Since 1998, the ICNIRP has recommended a limit to protect against this kind of radiation. This recommended limit is followed in many countries, including Germany.
All that has so far been scientifically proven is that high-frequency radiation from cellphones and WLAN can warm human tissue. No further effects have been verified. According to the ICNIRP, a temporary warming of up to one degree poses no risk to health, as this is within the normal range of physiological fluctuation. Tissue temperature can also rise temporarily during sport or when consuming hot drinks, for example.
The specific absorption rate (SAR) describes how the body absorbs radiation and processes the absorbed energy. It measures the amount of energy (watt) absorbed per kilogram of body mass (W/kg). Full-body exposure to high-frequency radiation for approximately 30 minutes, for example, is equivalent to a SAR value of 4 W/kg, leading to an increase in core body temperature of one degree.
The ICNIRP set a precautionary buffer and recommends a SAR limit of 2 W/kg for individual body parts such as the head and torso. In the USA, the FCC sets the limit at 1.6 W/kg.
According to manufacturer data, the smart glasses we use fall significantly below the maximum SAR value of 2 W/kg recommended by the ICNIRP. When measuring the SAR value of smart glasses, we have to take into account the standard EN 62209-1 (case “Making telephone calls with the cellphone to the ear”), which sets precisely specified procedures. This means the values of the respective case are usually comparable.
According to the current state of knowledge and based on previous exposure measurements, the high-frequency radiation generated by wireless networks is too weak to have verifiable and acute effects on health as a result of increased body temperature through absorption. Based on these results, you can integrate smart glasses into your business processes with complete peace of mind.