Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
ABSENCE OF OCULAR PATHOLOGY AFTER REPEATED EXPOSURE OF UNANESTHETIZED MONKEYS IN 9-3 GHZ MICROWAVES
McAfee, R.D., Longacre, A. Jr., Bishop, R.R. et al. · 1979
1979 monkey study found no eye damage from 9.3 GHz microwave exposure, informing early safety standards.
Plain English Summary
This 1979 study examined whether repeated exposure to 9.3 GHz microwave radiation causes eye damage in monkeys. The research found no ocular pathology (eye damage) after repeated exposures, suggesting this specific frequency and exposure pattern did not harm primate eyes. This research contributed to understanding microwave safety limits for human exposure.
Why This Matters
This primate research from 1979 represents important early work on microwave safety, particularly for eye health. The 9.3 GHz frequency studied falls within the range used by some radar systems and industrial microwave applications, though it's higher than most consumer devices like WiFi (2.4-5 GHz) or cell phones (0.7-2.7 GHz). The absence of eye damage in these monkeys helped inform safety standards, but we must consider that exposure patterns in 1979 laboratories may not reflect today's chronic, multi-source exposures.
What's particularly relevant is that eyes are considered especially vulnerable to microwave radiation because they have limited blood flow to dissipate heat and contain the lens, which has no blood supply at all. The fact that researchers specifically chose to study eye effects underscores this concern. While this study found no damage, it represents just one frequency and exposure scenario in the complex landscape of EMF research.
Exposure Details
- Power Density
- 150 mW/cm²
Exposure Context
This study used 150 mW/cm² for radio frequency:
- 15,000Mx above the Building Biology guideline of 0.1 μW/m²
- 250Mx above the BioInitiative Report recommendation of 0.0006 μW/cm²
Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.
Where This Falls on the Concern Scale
Study Details
To determine if repeated exposure of unanesthetized monkeys to 9.3-GHz microwaves causes ocular pathology
Unfettered monkeys (Macaca mulatta) were trained to expose the face and eyes to pulsed microwave rad...
No deleterious effects such as cataracts were observed
Show BibTeX
@article{absence_of_ocular_pathology_after_repeated_exposure_of_unanesthetized_monkeys_in_g5271,
author = {McAfee and R.D. and Longacre and A. Jr. and Bishop and R.R. et al.},
title = {ABSENCE OF OCULAR PATHOLOGY AFTER REPEATED EXPOSURE OF UNANESTHETIZED MONKEYS IN 9-3 GHZ MICROWAVES},
year = {1979},
}