Retinal damage experimentally induced by microwave radiation at 55 mW/cm2.

Acta ophthalmologica · 1979 · Mixed · Low evidence

← Research stream

MixedLow evidencePaper 6078

Study snapshot

PublicationActa ophthalmologica · 1979

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

The action of 550 W/m2 (mean) 3100 MHz pulsed radiation on the rabbit retina in vivo was investigated by fundus photography, blood-retinal barrier tracers, light and electron microscopy, either after a single 1--1.5 h exposure or after a series of repeated 1 h exposures for up to 53 h during about 100 days. The electron microscopic investigation of the repeatedly exposed retinas revealed degenerative changes in the retinal neurons. The neurons appeared depleted of their cytoplasmic constituents and often contained phago-lysosomal structures with myelin bodies. There were many degenerating synaptic boutons. The glial cells displayed reactive changes. These ultrastructural changes could not be demonstrated by the other methods used. A single microwave exposure, followed by an induced 70--100% blood-pressure increase, did not enhance blood-retina barrier permeability to tracers. There was no evidence of blood brain barrier leakage. These studies show that the rabbit eye can be affected by microwave radiation at intensities lower than previously reported.

Machine Enhanced Logic

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 typeanimal

Effect directionmixed

PopulationRabbits (in vivo retina)

Sample sizeNot supplied

Exposuremicrowave · 3100 MHz · Single 1–1.5 h exposure or repeated 1 h exposures up to 53 h over ~100 days

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Repeated exposures to 3100 MHz pulsed radiation were associated with degenerative ultrastructural changes in retinal neurons and reactive changes in glial cells detectable by electron microscopy. A single exposure combined with induced 70–100% blood-pressure increase did not enhance blood-retinal barrier permeability to tracers, and there was no evidence of blood-brain barrier leakage.

Outcomes measured

Retinal ultrastructural/degenerative changes (electron microscopy)
Glial reactive changes
Blood-retinal barrier permeability to tracers
Blood-brain barrier leakage (evidence of leakage)

Limitations

Sample size not reported in abstract
Exposure metric reported as power density; SAR not provided
Ultrastructural changes were detectable only by electron microscopy; other methods did not demonstrate these changes
Details of exposure parameters beyond frequency, pulsing, intensity, and duration are not provided in abstract

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 3100,
    "sar_wkg": null,
    "duration": "Single 1–1.5 h exposure or repeated 1 h exposures up to 53 h over ~100 days"
  },
  "population": "Rabbits (in vivo retina)",
  "sample_size": null,
  "outcomes": [
    "Retinal ultrastructural/degenerative changes (electron microscopy)",
    "Glial reactive changes",
    "Blood-retinal barrier permeability to tracers",
    "Blood-brain barrier leakage (evidence of leakage)"
  ],
  "main_findings": "Repeated exposures to 3100 MHz pulsed radiation were associated with degenerative ultrastructural changes in retinal neurons and reactive changes in glial cells detectable by electron microscopy. A single exposure combined with induced 70–100% blood-pressure increase did not enhance blood-retinal barrier permeability to tracers, and there was no evidence of blood-brain barrier leakage.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "Exposure metric reported as power density; SAR not provided",
    "Ultrastructural changes were detectable only by electron microscopy; other methods did not demonstrate these changes",
    "Details of exposure parameters beyond frequency, pulsing, intensity, and duration are not provided in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "3100 MHz",
    "pulsed radiation",
    "rabbit",
    "retina",
    "electron microscopy",
    "degeneration",
    "blood-retinal barrier",
    "blood-brain barrier",
    "power density 550 W/m2 (55 mW/cm2)"
  ],
  "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

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: 10.1111/j.1755-3768.1979.tb00483.x
PubMed: 452882

Read the original paper →

Related papers

← Back to the Research Library