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Threshold Ocular Exposure to Near Infrared Radiation for Causing Acute Opacification in the Rabbit Lens.
Tsutomu Okuno1,2, Masami Kojima3, Nailia Hasanova3
1Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan.
Photochemistry and Photobiology
|November 1, 2021
Summary
Determining infrared radiation (IR) exposure thresholds for cataract formation is crucial for worker safety. This study found that shorter exposure durations require higher IR irradiance to cause acute lens opacification in rabbits.
Area of Science:
- Ophthalmology
- Occupational Health
- Biophysics
Background:
- Epidemiological studies link intense infrared radiation (IR) exposure in industries like glass and steel manufacturing to increased cataract prevalence.
- Animal studies confirm that IR exposure can induce acute crystalline lens changes, potentially leading to cataract formation.
- Knowledge gaps exist regarding the threshold IR exposure levels that cause acute cataractous changes, hindering the establishment of effective short-term exposure limits.
Purpose of the Study:
- To determine the threshold irradiance of 808 nm wavelength IR radiation required to induce acute lens opacification in rabbit eyes for various short exposure durations.
- To provide data for refining occupational safety guidelines and short-term exposure limits for IR radiation.
Main Methods:
- Rabbit eyes were exposed to 808 nm wavelength IR radiation at varying irradiances.
- Exposure durations tested included 6 minutes, 3 minutes, 1 minute, 30 seconds, 10 seconds, and 4 seconds.
- The threshold irradiance causing acute lens opacification was determined for each exposure duration.
Main Results:
- The threshold irradiance for IR-induced lens opacification increased as exposure duration decreased.
- Threshold irradiance ranged from 1.1 W·cm⁻² for 6-minute exposures to 4.1 W·cm⁻² for 4-second exposures.
- These findings align with current International Commission on Non-Ionizing Radiation Protection (ICNIRP) exposure limits but suggest potential need for revision at shorter durations.
Conclusions:
- The study establishes specific threshold IR exposure levels for acute cataractogenesis in rabbits across a range of short exposure durations.
- The data supports the consistency of ICNIRP limits within the tested range but highlights the need to consider lowering limits for very short-term IR exposures.
- This research is vital for enhancing preventative measures and safety standards in occupational settings with high IR radiation exposure.
