The Varilux Comfort high index glass lens has
a wider "corridor" than the standard progressive lens, which makes it
more comfortable to wear. The "corridor" is the hourglass-shaped area
in the middle of the lens that you can see through. With a wider
corridor, you do not have to move your head as much to see objects on
the sides. Varilux is made by Essilor, the world’s largest maker of eyeglass lenses.