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Lenses & Coatings

Anti-Reflective Lenses
Normal lenses often create glare, reflections, and “ghost images.” Now that can be eliminated with anti-reflective lenses.

What we see is a result of light being processed by our eyes. With normal glasses, much of the light reflects off the lenses. This produces glare. It also reduces the wearer’s visual acuity. In other words, the light reflections are a cosmetic and visual problem.

Anti-reflective lenses increase light transmission through the lenses to 99.5 percent. It makes it easier to see and easier for others to see you. These lenses are especially useful for those viewing computer screens and driving at night.

High Index Lenses
Previous to the last few years, the only materials available to use for lenses were glass and a hard resin called CR-39. But recently, high index lenses have become available. High index materials are named because they have a higher index of light refraction. Basically, they can do the same job that glass or CR-39 does, but high index lenses are much thinner and lighter. 

Here are a few things to remember.

Polycarbonate
The first and still most popular high index plastic is polycarbonate. Polycarbonate was originally developed for fighter jet cockpits. It is very strong, very light, and resistant to scratches and impact. Most sports lenses are made of polycarbonate.  These lenses are always recommended for children. 

High-Index
High index lenses, such as 1.67 and 1.74 are much thinner than regular glass or plastic. Drs. Healey or Gavin; or Pam and Lindsey in the optical shoppe to recommend which high index lens is right for you.

Bifocal Lenses
For many people, different lenses are needed for seeing at different distances. Bifocal lenses allow the wearer to look through two areas of the lens. One area focuses on distant objects. The other is used for reading.

Most of the time the “reading” area is smaller, shaped like a sideways “D”, and found in the lower hemisphere of the lens. These bifocals are called line bifocals or flat-tops. If you are focusing on distant objects, you look through the top portion of the lenses. To read a book, magazine, or newspaper, you look through the “reading” area. One thing that is difficult about using bifocals is dealing with the line between the two vision areas. Fortunately, recent technologies have developed a new type of lens, called the no-line, or progressive lens.

Progressive Lenses
One of the main problems with bifocal and trifocal lenses is the problem of eye fatigue. It can be difficult to switch from one focusing power to another. This can make your eyes tired, and can lead to a headache, sore neck and sore back.

A recent variation of bifocals and trifocals are called no-line lenses or progressive lenses. Progressive lenses provide a smooth transition between focusing on near and distant objects.  A gradual change in power allows the wearer to focus on objects at all distances. Distant objects are viewed through the upper portion of the lens, while near objects are viewed through the middle or lower portion of the lens. These lenses can work well for computer users, although it does depend on the ergonomics of their workstation.


Polarized Lenses
Glare from wet roads, light reflecting off other vehicles, and glare from your own windshield can be distracting and dangerous.  Natural reflections are also uncomfortable while on or near the water: fishing, sailing, at the beach or on the ski hill.  To eliminate this glare, we offer polarized lenses. Polarized lenses eliminate almost all glare, reducing eye strain and increasing visibility. Polarized lenses are the most effective way to reduce reflections and glare.

Fisherman can eliminate the bright reflections from the water and actually see into the water more easily than with any other sunglasses.  Golfers can see the green easier, and runners and bikers can enjoy reduced glare from the road. In addition, sailors can see distance racing and navigation marks along with subtle wind changes on the water.

Specialty Lenses
We all have heard the phrase, “Different strokes for different folks.” Well, this holds true in terms of selecting lenses for your eyeglasses.  No matter what your particular need, there is a specialty lens designed for you.

For example, a specialty lens that is becoming increasingly useful is designed for computer users. Computer lenses have “windows” designed for viewing your computer screen, documents on your desk, and distant objects. The lenses are designed to reduce Computer Vision Syndrome, or CVS, which is characterized by headaches, eye strain, neck and back aches, dry eyes, blurred vision, and double vision.
 
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