Try this - press down on the tips of your eyeglass earpieces (behind your ears). Does this lift your glasses? Notice your eyeglass pressure is gone and glasses will not slide down. Eyeglass problems solved! This is what iLiftz™ Weighted Eyeglass Socks and Eyeglass Straps will do for you.

 "Will my glasses float off my nose?" If that happens, you should exchange for a lighter weight.  Ideally, you want your eyeglass pressure to be reduced without changing your line of vision. 

So even though your glasses may still sit on your nose, you should notice a reduction in the pressure that causes dents, marks, and slipping. 

Also, keep in mind that the straighter your eyeglass arms, the more lift you get.