This may not be what you're seeking, but I've never used a mirror nor felt like I needed one.

Don't want to get into an A&S discussion here, especially with such a seasoned pro as chip, but as I mentioned earlier, there are no blind spots with a moveable head mounted mirror.

A head check is never a bad idea, just not really necessary even though I often do it myself strictly from habit.

We can aim that mirror absolutely anyplace we need to see. Now if the purpose of turning around is to show cagers you intend to move, that's a different story.

Here's an example...my latest commute is on a rural highway with a shoulder. I prefer not to ride on the shoulder if there is no traffic from behind so I ride in the lane and move over when necessary and then back to the lane when the traffic clears without ever having to turn around with a head check.

Of course the other advantage of being in the lane when cars approach is they immediately start to give me room thinking I may never move over but I always do.

In a car if you are moving laterally like that, a head check is absolutely necessary.

directly from the linked page...

[TABLE]
[TR]
[TD="colspan: 2, align: left"]SPECIFICATIONS[/TD]
[/TR]
[TR]
[TD="width: 30%, align: right"]Weight:[/TD]
[TD]54 grams, mirror & housing complete[/TD]
[/TR]
[TR]
[TD="width: 30%, align: right"]Mirror Material:[/TD]
[TD]Hand cut, optical quality glass[/TD]
[/TR]
[TR]
[TD="width: 30%, align: right"]Mirror Shape:[/TD]
[TD]Convex, ovalized[/TD]
[/TR]
[TR]
[TD="width: 30%, align: right"]Mirror Height:[/TD]
[TD]53mm (2.09 inches)[/TD]
[/TR]
[TR]
[TD="width: 30%, align: right"]Mirror Width:[/TD]
[TD]33mm (1.30 inches)[/TD]
[/TR]
[/TABLE]

The head check is more habit for me too, since there are times...like when doing the roadie thing...when I don't have any mirror. It's also a lesson from ole Ronnie Raygun - trust, but verify.

I have to agree this is the best out there. They will hook to your glasses or helmet and give the best "look" behind you that I have found.

yep, I get it....too bad everybody isn't as smart as us, eh?

I felt T-a-L and 3rdI eyeglass mirrors were too bulky, too expensive:

on the other hand I have one like yours and can't get comfortable with it. Got it cause I like the minimalist style. If it had been the first kind I tried I likely would have made it work but I had used the Take a Look for a while so had become comfortable with that style. To each his own but whatever the style, I would never be without one on the commute.

+1 the Reflex mirror is really good, its flexibility lets me get it in an effective position.

I love how you can just spin it up out of the way when not in use.

I looked at the link but did not open it - because I did not recognize it I assumed it was a knock off. Anyway - great minds stink alike...

Find someone who uses a mirror similar to the one you want to use to help set it up. The first few times I tried to use a Third eye mirror the results were frustrating. Finally I figured out how to use it and used one for 10 years before switching to a Safety Zone. I have no problem seeing what is behind me while still being able to keep an eye on what is in front of me. at most it takes only a slight move of my head to see pretty much everything on the road. In general for an eyeglass or helmet mirror try to set it up so that you can just see the bottom half or so of your ear in the mirror and adjust as needed from there.

Satisfaction with the eyeglass mounted mirrors seem due, partially at least, to the position of the rider. I ride semi-recumbent/crank-forward designs that leave me sitting upright. In this position, I'm afforded a clear rearward vision at varying angles with quick exacting placement that soon becomes instinctive. I've tried every type of mirror, nothing coming even close to the awareness & control over my riding environment these mirrors allow me. On a typical road bike/mountain bike, however, my shoulder blocks part of my view through the mirror & clear angle views becomes more difficult & disruptive (IMHO & experience, of course).

Yep -- these work well for me!

I, too, use the Safety Zone helmet-mounted mirror. It has become such a vital safety component that I cannot imagine riding without it. It is huge, it provides a very clear view, it provides a stable view on all but the roughest of roads, and its articulated design is easy to adjust.