My experience with helmet mounted mirrors has been less than ideal. I find that even when my helmet is extra tight, the mirror moves with the helmet, picking up road and wind vibrations which in turn, distort my rear view. Also, I've been challenged by similar mounting issues.

I don't seem to experience the vibration distortion with mirrors mounted to the arm of my glasses. My guess is my Halo headband holds them tight against my skull.

However, keeping the mirror secure to the arm can be challenging. I've broken several of [MENTION=418370]canklecat[/MENTION] 's example above. I've had them come off while riding and splatter across the road. Or the arms break due to the thickness of the glasses arm. Finally, I produced a sewn-on leather band to secure the mirror to the arm.

The leather band is laced to the arm, like shoelaces.

One of the plastic retaining arms had broken on the above mirror.

The mirror can fold inside the arms for storage in the case.