In my RSS feeds today, I got an article named Gunnar Glasses Reduce Computer Eyestrain, Are 75% Off for the Next Two Days which links to a previous article about their benefits:
Gunnar's website claims they protect your vision by filtering out "artificial" light, and relaxes your eyes, so you get tired slower. They also claim that it prevents dryness, but I'm not quite sure how it would go about doing that, since the glasses aren't like those James Worthy or Horace Grant goggles that encase your eyes—they're just normal glasses.
On Gunnar's own website, they claim:
GUNNARS increase contrast, comfort and focus while minimizing eye fatigue and visual stress for anyone who spends long hours staring at digital screens. GUNNAR eyewear is powered by i-AMP lens technology comprised of a proprietary lens material in an advanced geometry tuned for intermediate viewing distance and finished with custom formulated lens filters, tints and coatings.
For specific claims (that seem relevant):
Improve contrast and filter out UV.
IONIK lens tints improve overall contrast and comfort by filtering out harsh artificial light, eliminating UV rays and reducing high-intensity visible light.
iFi lens coatings include an anti-reflective layers to reduce glare and an exterior hard coat that minimizes environmental damage and scratching.
FRACTYL lens geometry includes a specifically tuned focusing power to enhance detail and a highly wrapped lens design that limits air currents near the eye.
Is there any evidence that these things actually reduce eye strain or fatigue? Or that they're beneficial at all?
I've seen a couple more articles about this recently, but they seem to be providing evidence that Gunnars are better than low-quality glasses, but they market them primarily to people who don't need glasses, so I think the relevant claim is that "wearing Gunnar glasses is better than not wearing glasses".