If you rely on a headband you will lose your glasses. I have even had glasses come off from under a helmet (seriously not a fan of helmets).
The only way to be certain you won't lose your glasses is to leash them. I have used the zip puller for the wetsuit, which works ok. It's a pain when your glasses hang off behind you after a big crash. Chest/no zip suits don't have a puller.
I made an elastic and velcro neck leash and that worked very well. It's super secure and if designed properly will make the glasses less likely to come off in the first place. It needs to be releasable in the unlikely event that you are being strangled by your neck leash. The leash I made was a copy of the Kurtis leash.
Lips glasses come with a silicone neck leash. It should slip over your head, or break in an emergency. The Lips have never come off so I don't know how robust it is.
Of course, if you're wearing sunglasses then you should be wearing a hat that will help retain your glasses. After years of messing about I think I finally have the hat thing wired.
Lost my last pair of glasses when the knot on the wetsuit zipper leash came undone
I have a pair of v1 720-armour Sharks that have a long string leash. I attach that to one of those scammy power balance necklace things cos it's soft and clips easily.
Now, my Sun Dog glasses I just use the strap with, cos I want to lose them so I want an excuse to buy new ones, but haven't managed to yet
I use Seaspecs (or similar, obviously made in the same factory). After each time I use them I rinse them with diluted washing up liquid. Then just before I next use them I use Oceanic anti-fog spray. I tie the strap to a loop around my neck so that if they come off I don't lose them. Works for me.
I did the same thing and did extensive comparisons between the Lips and the Seaspecs. When they work Seaspecs (and others) are just fine. I always had days where the Seaspecs just didn't work. Water would sheet across the lenses, and/or dry into great smears of salt and muck.
The Lips Typhoons are not perfect, but at their worst they're still at least as good as a well cleaned, treated pair of other glasses. You get individual drops, sometimes quite a lot. But the space between the drops is clean and clear.
Send me a couple of pairs of Lip sunglasses and I'll do a comparative test to verify your results.