I've seen a lot of posts about sweat in the eyes, and living in Florida, I know what you mean.
I started using the Halo, and it worked pretty good, but with all the humidity and heat, begins to fail after a few miles.

The solution?

The Halo AND a HeadSweats Scullcap. Wear them together, it really works. The Halo underneath the scullcap, of course.
Hope this helps.

Happy Riding.

Slackerprince