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Effect of Occupational Exposure to Low-frequency Electromagnetic Fields on Cataract Development

Journal of Ophthalmic and Vision Research · 2025 · Harm · Low evidence

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HarmLow evidencePaper 2655

Among 100 electricity company employees grouped by exposure status, cataract frequency was 62.2% in the exposure group versus 53.8% in the non-exposure group. A significant difference was reported for nuclear opacity grading (P=0.003), and nuclear and posteri…

Study snapshot

PublicationJournal of Ophthalmic and Vision Research · 2025
Study typecross_sectional
Reported directionHarm
Evidence ratingLow

Abstract

Category: Epidemiology Institution: Zahedan Electricity Company Tags: low-frequency electromagnetic fields, occupational exposure, cataract, eye health, power lines, visual impairment, epidemiology DOI: 10.18502/jovr.v20.12281 URL: pubmed.ncbi.nlm.nih.gov Overview ⚡ Purpose: Cataracts are the second leading cause of visual impairment worldwide. This study aimed to examine the impact of occupational exposure to low-frequency electromagnetic fields on cataract development. Methods - 100 employees of Zahedan Electricity Company were enrolled. - Participants assigned to four groups: regular, operational, operator personnel (all exposed), and non-exposure. - LOCS III grading system used to evaluate risk for different cataract types: nuclear, posterior subcapsular, and cortical. Findings - 👁 Cataract frequency: 62.2% in the exposure group vs 53.8% in the non-exposure group. - Significant difference observed for nuclear opacity grading (P = 0.003). - 💡 Correlation found: Nuclear and posterior subcapsular cataract grades were significantly associated with longer work experience in the exposure group (P < 0.018). Conclusion 🚩 This study's findings indicate that occupational exposure to low-frequency electromagnetic fields, such as those found near power lines, power plants, and distribution posts, may be a risk factor for cataract development, especially nuclear cataracts.

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 typecross_sectional
Effect directionharm
PopulationEmployees of Zahedan Electricity Company
Sample size100
ExposureELF · longer work experience (duration not quantified)
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Among 100 electricity company employees grouped by exposure status, cataract frequency was 62.2% in the exposure group versus 53.8% in the non-exposure group. A significant difference was reported for nuclear opacity grading (P=0.003), and nuclear and posterior subcapsular cataract grades were significantly associated with longer work experience in the exposure group (P<0.018).

Outcomes measured

  • Cataract frequency/prevalence
  • Nuclear cataract (nuclear opacity grading; LOCS III)
  • Posterior subcapsular cataract grading (LOCS III)
  • Cortical cataract grading (LOCS III)

Limitations

  • Exposure metrics (field strength, frequency, or dosimetry) not reported in the abstract
  • Study design appears observational/cross-sectional, limiting causal inference
  • Potential confounding factors and adjustment methods not described in the abstract
  • Group sizes and exact definitions of exposure categories not provided in the abstract
View raw extracted JSON
{
  "study_type": "cross_sectional",
  "exposure": {
    "band": "ELF",
    "source": "occupational",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "longer work experience (duration not quantified)"
  },
  "population": "Employees of Zahedan Electricity Company",
  "sample_size": 100,
  "outcomes": [
    "Cataract frequency/prevalence",
    "Nuclear cataract (nuclear opacity grading; LOCS III)",
    "Posterior subcapsular cataract grading (LOCS III)",
    "Cortical cataract grading (LOCS III)"
  ],
  "main_findings": "Among 100 electricity company employees grouped by exposure status, cataract frequency was 62.2% in the exposure group versus 53.8% in the non-exposure group. A significant difference was reported for nuclear opacity grading (P=0.003), and nuclear and posterior subcapsular cataract grades were significantly associated with longer work experience in the exposure group (P<0.018).",
  "effect_direction": "harm",
  "limitations": [
    "Exposure metrics (field strength, frequency, or dosimetry) not reported in the abstract",
    "Study design appears observational/cross-sectional, limiting causal inference",
    "Potential confounding factors and adjustment methods not described in the abstract",
    "Group sizes and exact definitions of exposure categories not provided in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "low-frequency electromagnetic fields",
    "ELF",
    "occupational exposure",
    "cataract",
    "nuclear cataract",
    "posterior subcapsular cataract",
    "LOCS III",
    "power lines",
    "power plants",
    "distribution posts",
    "eye health",
    "epidemiology"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.95,
      "reason": "Study examines occupational low-frequency EMF exposure among electricity company employees and cataract outcomes."
    }
  ]
}
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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: 10.18502/jovr.v20.12281
PubMed: 40400659

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