The Flip-Up Tac Glasses fit over existing eyewear. They flip out of the way and snap right back into place. With Tac Glasses you will be able to see clearly without the glare! They enhance color, block blinding glare and improve optical clarity. The secret is Bell & Howell's patented light filtering technology. Stop squinting when you are driving down the highway and see with optimal clarity. Tac Glasses provide 100% UV protection and feature polarized lens. They are inspired by the sunglasses worn by our heroes in uniform so they can survive in even the harshest conditions. Ordinary sunglasses just block light and make everything darker. Tac Glasses filter the light to make everything clearer.