Sunglasses or clear lenses?
Tinted frames suit outdoor use, such as driving, walking or working outside, and look unremarkable in daylight. Clear or lightly tinted frames work indoors and in meetings, where sunglasses would stand out. If you need one pair for both, look for models with interchangeable lenses.
Resolution is worth paying for here. Because the camera moves with your head, footage is less stable than a fixed camera, and higher resolution gives you more usable detail when you review it. Check the recording time too, since battery capacity is limited by the size of the frame.
Related
For a chest-height angle rather than eye level, see spy pen cameras. For the full range of worn and carried cameras, see wearable spy cameras.
Common questions
Can people tell? The lens sits in the bridge rather than the frame front, where it is hard to pick out at conversational distance.
Do they record audio? Most do. Audio carries different rules from video in New Zealand, so check what applies before recording conversations.