Investigation of the impact of electromagnetic fields emitted close to the head by smart glasses

Biomedizinische Technik. Biomedical engineering · 2022 · Unclear · Low evidence

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Study snapshot

PublicationBiomedizinische Technik. Biomedical engineering · 2022

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingLow

Abstract

Investigation of the impact of electromagnetic fields emitted close to the head by smart glasses Philipp Jungk, Matthias Wienke, Christoph Schiefer, Ulrich Hartmann, Volker Harth, Claudia Terschüren, Carsten Alteköster, Daniel Friemert. Investigation of the impact of electromagnetic fields emitted close to the head by smart glasses. Biomed Tech (Berl). 2022 May 17. doi: 10.1515/bmt-2021-0301. Abstract The functionality of smart glasses includes the possibility of wireless communication. For this purpose, WiFi or Bluetooth modules are integrated into the glasses. They emit electromagnetic radiation in the vicinity of the user's head. This simulation study investigates the impact of varying positions, frequencies, and antenna types of the embedded WiFi or Bluetooth modules on different tissue types in the human head. The absorption of electromagnetic energy causes the main impact on the tissue in the head. This physical process is best described by the specific absorption rate SAR. To investigate the effects of position, frequency, and antenna type on the simulated SAR values multiple simulations have been carried out considering real-world applications of smart glasses. The results show that the type of antenna has little effect on the SAR values of the different tissues. The maximum regulated output powers explain the frequencies' impact on the exposure. According to our findings, the greatest influence on the SAR values can be attributed to the placement of the antenna. Finally, our study reveals that positioning the antenna at the front side of the head is optimal for most tissues because of its maximal distance to the head tissues. pubmed.ncbi.nlm.nih.gov

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeexposure_assessment

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureRF

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

In simulations of smart glasses with embedded WiFi/Bluetooth modules, antenna type had little effect on SAR across different head tissues. Frequency-related differences in exposure were attributed to maximum regulated output powers, while antenna placement had the greatest influence; positioning the antenna at the front side of the head was reported as optimal for most tissues due to greater distance from head tissues.

Outcomes measured

Simulated specific absorption rate (SAR) in different head tissues
Impact of antenna position, frequency, and antenna type on SAR

Limitations

Simulation study (no human measurements reported)
Specific frequencies, output powers, and numerical SAR values not provided in the abstract

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "RF",
    "source": "smart glasses (WiFi/Bluetooth modules)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Simulated specific absorption rate (SAR) in different head tissues",
    "Impact of antenna position, frequency, and antenna type on SAR"
  ],
  "main_findings": "In simulations of smart glasses with embedded WiFi/Bluetooth modules, antenna type had little effect on SAR across different head tissues. Frequency-related differences in exposure were attributed to maximum regulated output powers, while antenna placement had the greatest influence; positioning the antenna at the front side of the head was reported as optimal for most tissues due to greater distance from head tissues.",
  "effect_direction": "unclear",
  "limitations": [
    "Simulation study (no human measurements reported)",
    "Specific frequencies, output powers, and numerical SAR values not provided in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "smart glasses",
    "WiFi",
    "Bluetooth",
    "electromagnetic fields",
    "RF exposure",
    "head",
    "tissue",
    "specific absorption rate",
    "SAR",
    "antenna placement",
    "simulation"
  ],
  "suggested_hubs": [
    {
      "slug": "wearables",
      "weight": 0.86,
      "reason": "Assesses RF exposure from smart glasses worn on the head."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1515/bmt-2021-0301
PubMed: 35580838

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