As these lens zonules relax, you can either hold an object farther away or use bifocals to bring an image to a more comfortable position. Bifocals are the cure for arms that are not long enough." ...

Progressives lenses approach eyesight in this same way, affording the wearer the ability to adjust between different focal ...

The bifocal lenses are made from bilayer structures of liquid crystal (LC) cells and LC polymer. These lenses split light with a left-handed circular polarization (LCP) into two focused light ...

We already have contact lenses that contain more than one prescription, enabling the wearer to adjust her focus depending on the distance from the object she is viewing—similar to bifocal or ...

Older adults who wear progressive-addition lens glasses appeared at increased risk for falls compared with older adults who wear bifocals, according to a study published in Optometry and Vision ...