FARGO - Those who wear bifocals and have difficulty adjusting their vision now have another option: eyeglasses that focus electronically. The new glasses, now available at several local optical shops ...

Researchers have developed a new type of bifocal lens that offers a simple way to achieve two foci (or spots) with intensities that can be adjusted by applying external voltage. The lenses, which use ...

Researchers developed a bifocal lens based on two layers of liquid crystal (LC) structures. The intensities for the two focal lengths can be easily adjusted by applying external voltage. WASHINGTON — ...