Choose the Fake Oakleys Frogskins Sunglasses Cheap for Sale lens with your degree, IPD and other precision data is closely related to the right of the lens allows you to see more clearly and more comfortable.

There are two kinds of resin lenses and glass. Glass, high hardness, quality heavy friable; translucent resin sheet is strong, lightweight unbreakable, protects against ultraviolet rays, but poor wear resistance. Highly refractive errors should use a resin sheet to reduce the weight of the lens; Children should not wear glass, because of the fragile and dangerous high. The thickness and refractive index of the lens depends on the degree of myopia lenses surrounding the central thin thickness, contrary hyperopia. The higher the degree of the thicker lens, the thinner the higher the refractive index of the lens. High refractive errors were the best choice for high refractive index Fake Oakleys Gascan Sunglasses Cheap for Sale lens.

Optical lens parameters and the relationship:
(1) IPD: eyes straight ahead or visual axis distance between the center of the pupil when two parallel!
(2) the refractive index of the lens: refers to the ratio of the lens through the air and speed when passing through the lens material. The larger the value, the smaller the lens thinner thicker. 1.5 Department 1.6 series, 1.67 series, 1.74 series four main categories.
(3) Coating Technology: the lens surface coated with a metal film are many trace element, increasing the light transmittance of the lens (94 ~ 99%) to see more clearly things complete. While special anti-fog coatings as well as radiation function. Common are green film, blue film, purple membrane, gold film, red film. Red purple blue film film which is basically anti-radiation film lens category, blue best. The most formal is green film, basically using this brand lenses, lens also has good anti-radiation function, and the lens than white, natural beauty of its films.
(4) spherical / aspherical: spherical lens to see things bend; aspherical Tiffany and Co Charm Bracelet Jewelry Outlet lens looks laps benefit is less, the eye will not be significantly reduced concave, and the other will not have to see things clearly bent.