A few years ago, I switched from the Take a Look mirror (which mounts on glasses) to the Hubbub mirror which mounts on the helmet. For me, it's an improvement. It stays on pretty reliably so it's one fewer thing to keep track of. My eyeglass prescription is mild, so I can ride without my glasses if I need to. I like riding without my glasses when it's raining because the rain obscures my vision. And now that my mirror is on my helmet. I still have the use of the mirror even after I take my glasses off.

The Hubbub mirror is very well made.
https://hubbubonline.com/product/hub...lmet-mirror-3/