After decades’ development, the eyeglass market is quite large that a great number of people in this world use sunglasses on a regular basis. Recognizing this expanding market, more and more designers have paid their attention to sunglass business in recent years. It is acceptable to say that nearly every notable designer is on the way to the sunglass market. Most of the high-end designers, such as Chanel, Dior, and Prada, are launching sunglass lines. There is a trend in the sunwear industry that sunglasses and fashion are linked closely. Sunglasses are supposed to become a casual accessory by both customers and designers. It is necessary to know some tips that are helpful for people who want to shop for a pair of sunglasses. Continue reading ‘Cool glasses frames with special designer sunglasses’ »
Single vision lenses are simple lenses to which we are all accustomed, they maybe for distance, near or both if you are under 40. After 40 years of age people begin to have difficulty changing focus from distant objects to near ones and back. This is because the lens of the eye becomes less pliable with age.
To overcome this it is possible to have a lens made with two seperate focuses, these are bifocal lenses and will be recognised as those having a small segment at the bottom of the glasses lens. they are either round or shaped like a letter D on its side, flat side up.
Varifocal lenses are blended bifocal lenses and give a variable focus effect.