I wear a SweatVac under my helmet. But no matter what you choose whether similar to a SweatVac or just a sweat band, it probably needs to be pulled right down to your eyebrows when you ride for long sweat drenching periods of time.
Several years ago I was having sweat get into my eyes even while wearing my SweatVac of many years. I realised that after seeing myself in the mirror and how dorky my bright yellow SweatVac looked showing from under the helmet, I'd been wearing it higher. After I gave up on the need to not look more stupid than I already do, pulling the SweatVac down to my eyebrows again eliminated the sweat dripping into them even on long rides.
I don't attribute it all to SweatVac. Probably any brand of similar, or dew rag or sweat band will work as long as you can get over the appearance thing and pull what ever you use lower on your brow.