Army

Eyewear Fog Tester Apparatus

A device to quantitatively assess the performance of anti-fog coatings for spectacles, goggles, and other eyewear

Other
The US Army has developed an empirical test to assess the performance of eyewear anti-fog capabilities.

The US Army has developed an empirical test to assess the performance of eyewear anti-fog capabilities.

The Natick Soldier RD&E Center (NSRDEC) has developed a standardized test platform for the performance evaluation of anti-fog coated eyewear. There currently exists no widely-established test method for the quantitative assessment of anti-fog coating efficacy. Disparate standards apply to sub-segments of the eyewear market, such as ski goggles or personal eye protection. Protective eyewear is required to prevent eye injuries and reduce solar glare. However, heavy exertion can result in fogging of the eyewear, creating negative impact on effectiveness and safety.

The Natick device uses empirical measurements of delta haze to determine effectiveness of coatings under condensation-inducing conditions. The 2nd generation test apparatus is suitable for testing spectacles and goggles. The 3rd generation device will be enhanced to test gas masks and similar items, as well as measure the effects of helmets and other items on the overall “system” effectiveness of eyewear designs. The Army has been working with eyewear manufacturers to improve the test systems design. Natick has also engaged with industry and ASTM to work toward an industry standard.

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