Does Glass+ VisionGuard really work?

Yes. Glass+ VisionGuard is a product we’re very proud of and represents technology developed over many years by professionals in the medical field (Vision Health Advisory Board) and PHD’s with many years of experience developing technologies in parallel fields. 

All said, it was still crucially important we test and validate Glass+ VisionGuard before bringing it to market. Afterall, harmful blue light is a very serious subject and has been shown to cause digital eye strain (synonymous with Computer Vision Syndrome), a condition present in today’s modern age with the presence of mobile devices and our tendency to spend multiple hours a day viewing those devices.

So, when we set out to develop Glass+ VisionGuard, we did so with a specific goal in mind: pair our best Glass+ screen protector with technology to filter the harmful high-energy visible (HEV) blue light that’s been shown to contribute to digital eye strain. And if we stopped there, it likely would have been a job well done. But filtering blue light isn’t enough by itself. The devices we use daily are expensive, and much of that cost can be attributed to high quality screens like the OLED screens found in many modern handsets. So, if we stopped at simply filtering blue light, we would be altering the color quality of that high-tech device you just purchased, and that’s just not acceptable. So, the second objective of Glass+ VisionGuard was to filter harmful blue light without altering the colors of your device screen.

Enter Healthe with Eyesafe® technology. Healthe is leading the industry in blue light filtration. They have mastered a solution that filters harmful blue light while balancing the rest of the visible light spectrum so that your view through Eyesafe’s filter is unaltered.

So how does all this work?

Well, it starts with the identification of the parts of the visible light spectrum that are considered most harmful. The widely accepted range of light considered most harmful is blue light from 415-455nm. Most devices we use today produce light in that range. For example, the graph below illustrates light emissions from a Google Pixel 3 XL. The highlighted blue section of the first curve shows light in the 415-455nm range.

Glass+ VisionGuard with Eyesafe technology takes a targeted narrow notch “cut” out of the harmful part of the blue light spectrum from 415-455nm. And if we stopped right there, we would have accomplished our first goal, but not our second which would have left your display looking yellow, much like other software-based solutions on the market today. That’s why our technology takes two additional narrow notch “cuts” from the visible light spectrum, effectively balancing out the colors you see, and returning your screen to its natural look. Think of this like an art class. Mixing yellow and blue paint makes green. Removing blue from the colors you see would make your view yellow, so taking away blue means we have to balance those colors elsewhere.

The chart below illustrates this effect in a fun, vibrant way.

*Chart not to scientific scale.

Does it really do all we say it does?

Testing the exactness of our blue light filtering technology in Glass+ VisionGuard is important, but it can be tricky business. There are a variety of methods to test light output, but some just aren’t detailed enough to track the very specific ranges of light we filter. For example, some peak luminance tests might measure light output in broad color bands, but they aren’t sensitive enough to pick up on the exact range of light filtered. These tests might show light filtration results in averages, making it appear as though Glass+ VisionGuard simply dims your screen across all color spectrums.

The reality is that in order to accurately test the specific light filtration through Glass+ VisionGuard, you would need to test light output using a spectroradiometer. One such system would be the Konica Minolta 2000 A, which measures the emitted luminance every 1 nm. Another option could be a Gamma Scientific system GS-1160. Both of these systems measure light output with a much finer resolution, identifying the filtering effects of Glass+ VisionGuard exactly.

Now our own testing is certainly one thing, but validation from a leading provider of product testing and certifications for the worldwide marketplace felt like the best strategy to ensure Glass+ VisionGuard achieved our goals. In 2018, Glass+ VisionGuard with Eyesafe technology became the first product to receive certification from TUV Rheinland for blue light filtration standard RPF 15. To test the light emitted from device displays while using Glass+ VisionGuard, TUV Rheinland used a spectroradiometer both before and after application of Glass+ VisionGuard.

Glass+ VisionGuard is a product our company is extremely proud of. It represents advancements in technology that not only protect your mobile devices from scratches and impacts, but also protect your eyes from harmful high-energy blue light. And with a mission so critical, there was only one way to bring Glass+ VisionGuard to market—with technology developed by leading eye care professionals and validated by TUV Rheinland certification for filtering light in the most harmful range.

We encourage you to try Glass+ VisionGuard on your device. And remember, Glass+ VisionGuard carries a limited lifetime warranty, ensuring InvisibleShield screen protection for as long as you own your device.

Was this article helpful?