bulletPlastic - Stronger than glass and half the weight.  Maximum comfort and durability.  Can be tinted to almost any color and density.
bulletHigh Index - Say good-by to your thick "coke bottle" lenses!  These are lightweight and about 20% thinner than regular plastic.  Includes UV protection and scratch resistance.
bulletPolycarbonate - Most impact resistant material.  Lens of choice for children and athletes because they are shatterproof and lightweight.  Includes UV protection and scratch resistance.
bulletPhotochromic - Lenses that change from nearly clear indoors to darker brown, gray, or green when outdoors.  Available in plastic and glass, these are a good choice if you are in and out of doors many times during the day.
bulletGlass - Traditional material with superior optics.  Very scratch resistant, but can be very heavy in some prescriptions.