good filtering work for these on-anaglyph glasses, few be like for standard blue glasses is a little bluer than cyan, causing a ghost image on some anaglyph pictures. The clamp to set the frame of view is not very convenient to fix and we are not always in front of the sight glass. Furthermore, the glasses are near large enough and leaves little room for the nose. Thus we have the pinching sensation of the nose in addition to the nose clip to the frame. But considering the price, however it is an article that, overall, fulfilled its function. Just a little uncomfortable over time.
