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Kodak Bifocal Lenses 2,199.00
Seiko Bifocal 7,999.00 7,799.00

Essilor Bifocal lenses

1,799.00

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Essilor Bifocal lenses

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(save 15%-70% Discounts on all  Eyeglasses)

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4) Wait about a week:That’s it! Our professional opticians will take apart your glasses, cut and install new prescription lenses and  ship everything back to you with either your old case or a new case and cleaning cloth with some Freebies.its that easy

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Coatings Available *

Coatings available in crizal uv,crizal forte uv,crizal prevencia,Titus,super hard coat

Index Available *

Thickness of lens Available
1.50(Basic material)
1.56(Standard material) up to 20%thinner &lighter
1.59(Air-wear),Non breakable lens up to 30% thinner and lighter

Note: Super Hard Coat Not Available in 1.59 Index

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Description

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Essilor Bifocal lenses

Essilor is the world leader in prescription lenses for spectacles
Essilor corrects, protects and prevents risks to the eye health of more than one billion people worldwide every day

Learn all about Essilor Brands and Lenses

LEARN ALL ABOUT OUR BRANDS OF LENSES

We strive to create the most beautiful, comfortable and durable corrective lens designs in the world.

Learn about vision

LEARN ALL ABOUT YOUR VISION

Your vision health is so important. Want facts about the why’s and how’s of vision?

Bifocals lenses

Bifocals with separate lenses

Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmati

History

Benjamin Franklin is generally credited with the invention of bifocals. Historians have produced some evidence to suggest that others may have come before him in the invention; however, a correspondence between George Whatley and John Fenno, editor of The Gazette of the United States, suggested that Franklin had indeed invented bifocals, and perhaps 50 years earlier than had been originally thought. However the College of Optometrists concluded:

Unless further evidence emerges all we can say for certain is that Franklin was one of the first people to wear split bifocals and this act of wearing them caused his name to be associated with the type from an early date. This no doubt contributed greatly to their popularisation. The evidence implies, however, that when he sought to order lenses of this type the London opticians were already familiar with them. Other members of Franklin’s circle of British friends may have worn them even earlier, from the 1760s, but it is at best uncertain (and arguably improbable?) that split bifocal lenses had a famous gentleman inventor.[1]

Since many inventions are developed independently by more than one person, it is possible that the invention of bifocals may have been such a case.

John Isaac Hawkins, the inventor of trifocal lenses, coined the term bifocals in 1824 and credited Dr. Franklin.

In 1955, Irving Rips of Younger Optics created the first seamless or “invisible” bifocal, a precursor to all progressive lenses.[2]

Construction

Original bifocals were designed with the most convex lenses (for close viewing) in the lower half of the frame and the least convex lenses on the upper. Up until the beginning of the 20th century two separate lenses were cut in half and combined together in the rim of the frame. The mounting of two half lenses into a single frame led to a number of early complications and rendered such spectacles quite fragile. A method for fusing the sections of the lenses together was developed by Louis de Wecker at the end of the 19th century and patented by Dr. John L. Borsch, Jr. in 1908. Today most bifocals are created by molding a reading segment into a primary lens and are available with the reading segments in a variety of shapes and sizes.The most popular is the D-segment, 28 mm wide.[citation needed] While the D-segment bifocal offers superior optics, an increasing number of people opt for progressive bifocal lenses.

Problems

Bifocals can cause headaches and even dizziness in some users. Acclimation to the small field of view offered by the reading segment of bifocals can take some time, as the user learns to move either the head or the reading material rather than the eyes. Computer monitors are generally placed directly in front of users and can lead to muscle fatigue due to the unusual straight and constant movement of the head. This trouble is mitigated by the use of trifocal lenses or by the use of monofocal lenses for computer users.

In an interesting legal case reported in the UK in 1969, the plaintiff’s ability to use bifocals was impaired by accident.[3]

Future

Research continues in an attempt to eliminate the limited field of vision in current bifocals. New materials and technologies may provide a method which can selectively adjust the optical power of a lens. Researchers have constructed such a lens using a liquid crystal layer sandwiched between two glass substrates.

Bifocals in the animal world

The aquatic larval stage of the diving beetleThermonectus marmoratus has, in its principal eyes, two retinas and two distinct focal planes that are substantially separated (in the manner of bifocals) to switch their vision from up-close to distance, for easy and efficient capture of their prey, mostly mosquito larvae. This is the first ever recorded use of bifocal technology in the animal world

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