CR-39 Polarized RX ( Gray / Brown )
 
Most lenses are plastic (glass is still available, but heavier and more expensive), but the least expensive plastic used for eyeglass lenses is called CR39 hard resin lenses. Hard resin lenses are good for everyday use. These lenses have the least distortion of any non-glass lens. For children or active adults engaged in sporting activities, we strongly recommend polycarbonate (impact resistant) lenses.

If the sphere on your prescription is higher than +/-3.00, you will benefit from the selection of a high index lens type. If the sphere on your prescription is higher than +/-4.00, we recommend a thin lens type. Thinner lenses have three advantages: they do not look thick, they do not magnify or minify your eyes when seen by others, and they are lighter.
 
How Do Polarized Lenses Work?
Light travels in waves, and the waves of normal light travel in several different directions. Combined, they create the visible light we see, whether it comes from the sun, a lamp, or a candle. But when light is reflected off of a flat surface or a body of water, it travels in only a single direction. This gives the reflected light an uncomfortable intensity that we call glare.
Normal sunglasses work by limiting the amount of light coming from all directions, dimming it so that you find it easier to look around without squinting. Polarized lenses go a step further, taking advantage of the fact that most reflected light travels in only one direction. Using a special chemical process that creates a special coating on the surface of the lens, these glasses filter out all light coming from that direction, virtually eliminating glare.
 
** Prescription Required **
During checkout :
1. Click add note to seller
2. Write your prescription
3. e-mail original prescription to eyejoaoptic@gmail.com