As intervener computer store day and night, I had sore eyes after hours of exposure to screens. I now use these glasses for several days (and nights!) And I see clearly the difference: no itchy eyes and burn! For those working on their pc for photography and retouching, these glasses are clearly not suitable as changing the perceived spectrum. But for others, and for affordable, DARK! The case is compact and rugged enough to take anywhere. A recommended purchase.
