We offer free basic 1.5 index lenses on all prescription eyeglasses. We provide opportunities to upgrade and add features during checkout. We make shopping online for your glasses simple, efficient and safe.
Best Price Guarantee
If you find a lower price online within 14 days of purchase, we'll price match it!
Oxygen permeability expresses the ability of the lens to let oxygen reach the eye by diffusion. It is dependent on the thickness of the lens and the material of the lens, especially concerning the water content.
A higher Dk value means higher level of oxygen can pass through the lens and reach the eye.