A progressive lens design is like a bi- or tri-focal lens in that it corrects more than one vision problem at a time. However, these lenses have no visible lines, improving the cosmetic appearance of ...

The lenses are made from a special type of plastic mixed with water. The water content lets oxygen pass through the lens to your cornea. That makes the lenses more comfortable, lessens the risk of ...

There had been speculation about building this type of lens, but Fresnel was apparently unaware of them when he proposed his lens for lighthouse use in 1819. His proposed lens was a bit different ...

Due to their significance in the global vision correction market, there are several options to choose from and factors to consider when making a purchase, such as the ...