WHAT ARE BIFOCALS AND HOW WORK THEY

 OK...you're over 40 and you can't read anything up close. Perhaps you should remove your spectacles so that you can read. Maybe you need those $3.00 pharmacy glasses, even if you wear them over your contact lenses. But you're becoming irritated because of all the on-and-off with the glasses. What should I do? It's time to discuss bifocals.


Bifocal glasses have a correction for distant vision on the top of the lens and a correction for reading on the bottom. Benjamin Franklin actually invented the first bifocal. Yes, the same person who used a kite and a key to discover electricity! Ol' Ben simply cemented the top half of one lens to the bottom half of another, resulting in what is now known as an "Executive" bifocal.

This basic lens has evolved into more advanced bifocal lenses. The flat-top bifocal is the most direct successor of the Franklin lens. These lenses include a big distance viewing region with a little insert or segment that helps you to focus on items up close. This form of bifocal has a fixed working distance, or how far away you can hold anything and still remain in focus.

What about viewing objects from a distance, say, on a computer screen? By the way, I think those bifocals that allow me to see the lines make me look older. Isn't there a newer lens available?

 Absolutely! Modern bifocal lenses are referred as as "no-line" or "progressive." The focus shifts smoothly from the top of the lens (distance), down the middle (arm's length), and to the bottom of the lens (reading distance). There is a "column of clarity," a sweet spot for each working distance for human vision, as we say. This column is typically formed like an hourglass.

Varilux progressive lenses, such as the Varilux Comfort and Varilux Physio, are among our favorites at SkyVision. We always make an effort to match the strengths of a particular lens to your specific visual requirements. Our doctors and opticians are masters in this field. If you have difficulty reading, come in and learn all about bifocals!

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