The influence of eyelashes on electric field distribution and absorbed power density in the cornea

Bioelectromagnetics · 2024 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 43

Study snapshot

PublicationBioelectromagnetics · 2024

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

The influence of eyelashes on electric field distribution and absorbed power density in the cornea under millimeter-wave exposure Foroughimehr N, Vilagosh Z, Yavari A, Wood A. The influence of eyelashes on electric field distribution and absorbed power density in the cornea under millimeter-wave exposure. Bioelectromagnetics. 2024 Oct 14. doi: 10.1002/bem.22526. Abstract As millimeter wave (MMW) technology, particularly in fifth-generation (5G) devices, gains prominence, there is a crucial need for comprehensive electromagnetic (EM) models of ocular tissues to understand and characterize EM exposure conditions accurately. This study employs numerical modeling to investigate the interaction between MMW and the cornea, aiming to characterize EM field distributions and absorption within an anatomically accurate eye model while considering the influence of eyelashes. Using the finite-difference time-domain (FDTD) method, we conduct simulations of EM radiation interactions from 20.0 to 100.0 GHz with a human eye model. Moreover, we analyze the temperature distribution increase within the eye model using a thermal sensor in XFdtd, employing a scheme based on the finite difference (FD) method. Our findings reveal a nonuniform distribution of the EM field, particularly intensified in corneal regions adjacent to eyelashes and eyelids. Despite similar EM field patterns, the presence or absence of eyelashes has minimal impact on temperature differences. However, the study highlights increased radiation absorption by the eyelid's epidermis at 100.0 GHz, reducing the rise in the cornea's temperature. 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 typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposuremmWave

Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

Using FDTD simulations from 20.0 to 100.0 GHz in an anatomically accurate human eye model, the electric field distribution was nonuniform and intensified in corneal regions adjacent to eyelashes and eyelids. The presence or absence of eyelashes had minimal impact on temperature differences, and at 100.0 GHz increased absorption by the eyelid epidermis reduced the corneal temperature rise.

Outcomes measured

Electric field distribution in cornea/eye model
Absorbed power density in cornea/eye model
Temperature distribution/temperature rise in eye model

Limitations

Numerical modeling/simulation study (no empirical human/animal measurements described in abstract)
Exposure conditions and model assumptions not detailed in abstract (e.g., incident power, geometry specifics)
No quantitative effect sizes reported in abstract

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "mmWave",
    "source": "5G devices",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Electric field distribution in cornea/eye model",
    "Absorbed power density in cornea/eye model",
    "Temperature distribution/temperature rise in eye model"
  ],
  "main_findings": "Using FDTD simulations from 20.0 to 100.0 GHz in an anatomically accurate human eye model, the electric field distribution was nonuniform and intensified in corneal regions adjacent to eyelashes and eyelids. The presence or absence of eyelashes had minimal impact on temperature differences, and at 100.0 GHz increased absorption by the eyelid epidermis reduced the corneal temperature rise.",
  "effect_direction": "unclear",
  "limitations": [
    "Numerical modeling/simulation study (no empirical human/animal measurements described in abstract)",
    "Exposure conditions and model assumptions not detailed in abstract (e.g., incident power, geometry specifics)",
    "No quantitative effect sizes reported in abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "millimeter wave",
    "MMW",
    "5G",
    "eye",
    "cornea",
    "eyelashes",
    "eyelid",
    "finite-difference time-domain",
    "FDTD",
    "absorbed power density",
    "temperature rise",
    "XFdtd"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.55,
      "reason": "Study explicitly frames millimeter-wave exposure in the context of 5G devices and models 20–100 GHz interactions with ocular tissues."
    }
  ]
}

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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: 10.1002/bem.22526
PubMed: 39402869

Read the original paper →

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