Bifocal lenses advanced little in the first half of the 19th century.

A bifocal lens could be considered a simple example.

The idea of the progressive lens came to him as he tried on his father's bifocal lenses.

This causes the individual to need visual assistance such as bifocal lenses.

Bifocal lenses provide correction for both near and distance vision on each lens.

He sees this special Manhattan world through the good satirist's bifocal lenses.

But a few days later without word, the team finds a 600-year-old parchment plea for help, and one dropped bifocal lens from the professor.

During that time he invented the cemented bifocal lens.

She pushes the cover a little more, sees an elderly male face peering down at her through thick bifocal lenses.

In a bifocal lens, this generally indicates what is to be placed in the top segment.

Their size is magnified by thick bifocal lenses.

She pulled her glasses down from her head, giving me a long look above the half-moon of bifocal lenses.

It was a bifocal lens.

Doctors say the markup is reasonable because the bifocal lenses take longer to fit than regular contacts and must be rechecked afterward.

He also used a close-up focusing filter on the bottom half of the camera lens, which, like a bifocal lens, is divided into two.

Dr. Naldi's bifocal lenses looked blindly up at the morning sky, askew in the dead, dark face.

This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens.

His voice was flat, his eyes-enlarged behind the bifocal lenses of his glasses-cold and hostile.

For example, the first bifocal lenses came from Rodenstock as did UV-absorbing lenses.

The Presby Corporation, a tiny biotechnology company in Dallas, is developing a plastic implant that would eliminate the need for reading glasses and bifocal lenses.

To correct this problem, you might get a pair of bifocal lenses, with the top part for seeing far objects and the bottom part for near objects.

Perhaps it is only natural that classical music listeners regard certain works by certain composers through a bifocal lens, taking account of both the near and distant perspective.

In addition to their non-prescription sports sunglasses, Maui Jim currently produces prescription lenses for their designs, including bifocal lenses.

Because available bifocal lenses are expensive, uncomfortable, difficult to fit, and often fail to focus sharply for both close viewing and for distances, none have met with success.

"The advantages and disadvantages of bifocal lenses" Zanen A Bull Soc Belge Ophtalmol.