I recently bought a pair of cycling glasses from TriEye, mainly because of their integrated rear-view mirror. After using them on the road, I can honestly say that this small feature has made a surprisingly big difference to my riding experience and, most importantly, to my sense of safety.
The mirror allows me to see what is happening behind me without having to turn my head. I can see cars approaching from the left well before I hear them, which gives me enough time to assess the situation and position myself safely on the road. For me, this is the biggest advantage of the TriEye glasses.
The glasses themselves are very comfortable. I chose the photochromic lenses and also ordered a second pair with blue reflective lenses. Switching between the two is very easy and takes about a minute.
I was also pleasantly surprised by how quickly I adapted to the mirror. I had no difficulties at all, and it took me less than an hour to get completely used to looking into it. I initially adjusted the mirror according to TriEye's instructions, with the shorter medial edge following the contour of my left cheek and the longer edge following the contour of my left shoulder.
I have seen some concerns from users who feel that the mirror is too large and might obstruct the left side of their field of vision. Personally, I don't find this to be an issue at all. Once properly adjusted, I barely notice the mirror while looking ahead, and I never feel that it interferes with my forward vision.
I have used the glasses both on my road bike, where my riding position is naturally a little more forward-leaning, and on my MTB. The mirror requires a small adjustment when switching between the two bikes, but this takes only a few seconds.
Another thing I really like is the size of the lenses. They are noticeably larger than those of some of my previous cycling glasses. This provides excellent protection from the wind, and even on longer rides I haven't had the problem I occasionally experienced with my previous glasses, where tiny particles of dust, sand or small insects would somehow find their way into my eyes.
Overall, I am genuinely impressed with the TriEye glasses. They are comfortable, practical and, above all, they give me a much better awareness of what is happening behind me without having to constantly turn my head.
I would wholeheartedly recommend them to any cyclist, especially those who spend a lot of time riding on the road. Once you put them on and realise that you can see what's happening behind you, you may find yourself wondering how you ever rode without them.
Highly recommended!