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Lenses and coating

Sunwear
To reduce exposure to UV rays and their effects, we recommend you invest in a pair of sunglasses which can provide at least 98% protection from UVA and UVB rays. While cheaper sunglasses can range from poor to excellent UV protection, our sunwear lines provide the best protection from the sun. We carry a large selection styles and colors.
Another product to consider is polarized sunglasses. Polarized lenses block light reflected from surfaces like a flat road or smooth water. If you’re involved in activities like water sports, skiing, golfing, biking, fishing, and even driving, polarized can be very helpful in reducing glare and giving a clearer view.
Finally, if you have a youngster in the family, it’s never too early to fit them with sunglasses. Children under the age of 20 are the most susceptible to the damaging effects of UV light. One concern of parents is that their child will scratch, break, or lose the sunglasses. However, that can happen to anyone. Having the sun protection to help the eyes from being damaged is well worth the risk of losing or breaking the sunglasses.

Anti-Reflective Coating
Normal lenses often create glare, reflections, and “ghost images.” Now that can be eliminated with an anti-reflective coating.
What we see is a result of light being sensed 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 coatings increase light transmission through the lenses to 99.5 percent. It makes it easier to see and easier for others to see you. These coatings are especially useful for those viewing computer screens and driving at night.

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. The top area focuses on distant objects while the bottom is used for reading. Bifocals were invented by Benjamin Franklin, and his style of bifocals are still available today.
Most of the time the “reading” area is smaller, shaped like a sideways ‘D’, and found in the lower half of the lens. These bifocals are called lined bifocals or flat-tops. If you are focusing on distant objects, you look through the top half of the lenses. To read a book, magazine, or newspaper, you look through the lower “reading” area. The Franklin style lenses are less common, and are split horizontally down the middle of each lens. One thing that is difficult about using bifocals is dealing with the line between the two vision areas. Fortunately, recent technologies have come up with a new type of lens, called the no-line, or progressive lens.

Cosmetic and Specialty Tints
Your glasses don’t have to be an eyesore to those around you. Eyeglasses can be a stylish accessory, a part of your personality, or a way for you to be different. There are a variety of frames to choose from, but you may not know that there are a variety of ways to improve the appearance of the lenses, too. Cosmetic tints are now available. These tints offer a variety of colors and shades. You can choose just about any color you like. Most of the time, pink, brown, grey and green are the most popular. Some lenses are clear at the bottom and gradually get more colored towards the top of the lenses. There are many ways to adjust your lenses to whatever style suits your personality. Some tints are also functional in that they help block off brightness by the sun.
Recently there has been much attention on a condition called Computer Vision Syndrome, or CVS. A special tint for your glasses along with a special prescription for computer work can reduce eyestrain associated with CVS. There are many other tints to choose from, as well.

High Index Lenses
Prior to the last few years, the only materials available to use for lenses were glass and a hard resin (plastic) 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 thinner and lighter. With high index lenses, you can avoid having thick “soda bottle” lenses.
When speaking of high index lenses, you may hear many unfamiliar numbers and terms. 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 because polycarbonate lenses are impact-resistant and shatter-proof.
Mid-Index: Other high index materials are classified by numbers. The higher the number, the thinner and lighter the lens. The lower numbers are classified as mid-index lenses. Examples of mid-index lenses are 1.54, 1.56, and 1.57. These lenses are thinner than glass, and nearly as strong as CR-39.
High-Index: High index lenses, such as 1.66, 1.74, and 1.9, are much thinner than glass, but not as strong. Talk with the doctor when deciding which high index lens is right for you.

Progressive Lenses
One of the main problems with bifocal and trifocal lenses is the problem of eye fatigue. It is difficult to switch from one focusing power to another. It can make your eyes tired, and it can even lead to a headache, sore neck and sore back.
A recent variation of bifocals and trifocals are multi-focal lenses, often called no-line lenses or progressive lenses. No-lines provide a smooth transition from focusing on nearby to focusing on distant objects because they do not have a distinct line separating the focusing powers. Instead, 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, intermediate objects such as computer screens are viewed through the intermediate part, while near objects are viewed through the lower portion of the lens.

Photochromics
If you need both clear prescription glasses and dark prescription sunglasses to accommodate an outdoor lifestyle, you should consider photochromic lenses. Photochromic lenses darken when exposed to UV rays. The change is caused by photochromic molecules that are found throughout the lens or in a coating on the front of the lens. When the wearer goes outside, the lenses darken or tint. When the wearer goes back inside, the lenses become clear.
Photochromics are available in brown or grey, meaning they can turn dark brown or dark grey in the sun. Grey is the much more popular color.

Polarized Lenses
Glare from wet roads, light reflecting off other vehicles, and glare from your own windshield can be annoying and dangerous. To eliminate this glare, you may want to get some polarized lenses. Polarized lenses eliminate almost all glare, reducing eye strain and increasing visibility. Polarized lenses are the most effective way to reduce glare.
Most glare comes from horizontal surfaces, so the light is “horizontally polarized.” Polarized lenses feature vertically-oriented “polarizers.” These polarizers block the horizontally-polarized light. The result is a glare-reduced view of the world. Polarized lenses can make a world of difference for any outdoor enthusiast. 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 joggers and bikers can enjoy reduced glare from the road. In addition, drivers can enjoy the safety and comfort that polarized lenses provide while driving.

Scratch Resistant Coating
If you have hard resin (plastic) lenses, whether CR-39 or high index, you should consider getting a scratch resistant coating. Resins and plastics are more susceptible to scratches than glass. Scratches damage the cosmetic look of the lenses as well as their performance. With a scratch resistant coating, you don’t have to worry so much about minor scratches on your lenses. However, if you
work in an environment that has lots of opportunities for your lenses to be scratched, an even stronger anti-scratch coating should be used. Some coatings have a 2 year warranty. However, it is important to remember that scratch resistant does not mean scratch-proof. All lenses are susceptible to scratches.

Specialty Lenses
We all have heard the phrase, “Different strokes for different folks.” Well, this holds true in terms of selecting glasses. There are different lenses for just about anybody. No matter what your particular need, there’s probably 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.
Another example is called the double D-segment lens, also known as the double flat-top lens. If you look through most of the lens, you can focus on distant objects. But you can also look through a D-shaped segment near the top of the lens to see nearby overhead objects more clearly. This is very useful if you are a pilot or painter or involved in work where you’re looking at nearby objects above your field of vision. The D-shaped segment near the bottom of the lens allows for reading.

Trifocal Lenses
Bifocals allow the wearer to read through one area of the lens, and to focus on distant objects through another area of the lens. However, as the eyes age, a stronger prescription is needed to read. This would be fine, but the stronger prescription that allows for reading makes it difficult to focus on objects at intermediate distances, such as grocery items on a shelf or your speedometer. Thus, trifocals are necessary for a third prescription for intermediate focusing.
Trifocals, also known as line trifocals, feature three areas of focusing power, each separated from the other by a distinct line. The three windows allow for focusing on distant objects, intermediately distanced objects, and for reading. The downside of trifocals is dealing with the lines between the different focusing powers. Fortunately, recent advances in technology have led to developments in no-line, or progressive lenses.

Sport Lenses
If you play sports, you should keep two things in mind related to your vision: protection and precision.
Sports lenses protect the wearer’s eyes. Sports like tennis, baseball, softball, and racquetball may see ball speeds of 90mph or more. In baseball alone, there are over 500,000 injuries per year! But that’s not the most common eye injury. Most eye injuries occur in basketball, where an elbow or a finger jabbed into the eye can cause corneal abrasions, fractured bones, retinal detachments, or even blindness. Polycarbonate and Trivex lenses are more resistant to impact than glass or plastic and offer protection for 90% of eye injuries. Protective eyewear fits well, features a padded bridge, has prescription or non-prescription lenses, and deep-grooved eyewires to prevent the lens from falling out.
The specialized lenses also optimize your vision. Depending on your sport, certain lenses are more appropriate than others. Dark, UV protection lenses are great for baseball and other outdoor sports. Golfers can benefit from gray-brown tinted lenses which make it easier to outline the course. Even if you don’t normally wear glasses, non-prescription sports lenses can benefit your performance. Some people think that lenses prevent the wearer from seeing the action, but many sports lenses have anti-fog, glare reduction, and scratch resistant properties. Some are also designed to maximize peripheral vision.