Why are lens enhancements so important?
Every environment has different hazards that are combatted with various types of prescription lenses and lens coatings. A list of Hollin Vision Safety's most used lenses and coatings follows :
Helps to prevent eye strain from prolonged computer or electronic device usage
- Anti-Reflective Coatings
Protects your eyes from harmful UV rays and high glare situations
Lenses that correct vision for distance and reading
Tints that protect eyes from a variety of harmful or obstructive lighting conditions
Higher prescriptions will require a thinner lens for less distortion
Darken when exposed to UV rays
Lenses that eliminate surface glare on reflective surfaces
Corrective lenses with invisible corridors for Distance, Mid-Range (computers), and Reading
Coatings that protect lenses from most abrasive environmental hazards
Task specific for a variety of unique situations (Computer work, Overhead, Precision, etc.)
Corrective Lenses with lined corridors for Distance, Mid-Range , and Near
A detailed description of the types of coatings & lenses we carry is below.
Normal eyewear often creates glare, reflections, and “ghost images.” Now all 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 reflection is both a cosmetic and visual problem.
Quality Anti-reflective coatings increase light transmission through the lenses to 99.5 percent. They make 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, enhancing normal vision to crisper, sharper vision.
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. A little-known fact is that 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 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 half of the lenses. To read a book, magazine, or newspaper, you look through the “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 developed a new type of lens, called the no-line, or progressive lens.
Cosmetic and Specialty Tints
Cosmetic tints offer a variety of colors and shades options for your eyewear. 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.
Recently there has been much attention on a condition called Computer Vision Syndrome, or CVS. A special tint for your glasses can reduce eyestrain associated with CVS. Tinting is also popular for use in shooting and driving glasses. Ask our opticians for more information.
High Index Lenses
Previous to the last few years, the only materials available for use as 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. With high index lenses, you can avoid having “Coke bottle” lenses.
When learning about high index lenses, you may hear many unfamiliar numbers and terms. Here are a few things to remember.
The first and still the 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 breaking. Most sports lenses are made of polycarbonate.
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. Mid-index lenses, such as 1.54, 1.56, and 1.57, are thinner than glass, and nearly as strong as CR-39.
High index lenses, such as 1.66, 1.74, and 1.9, are much thinner than regular glass or plastic. Talk with your doctor to decide which high index lens is right for you.
Not all Progressive lenses are created equal. No matter how you surface it, standard or digital, one sided or two sided, the quality of the design determines the potential performance of a lens. Different surfacing formats influence how much of the performance potential of the lens design is delivered, but even the most advanced digital surfacing will not make a substandard lens design into a good one. Only digital or free-form lens designs are developed based on thousands of real wearer tests. Four out of five independent eye care professionals say that this technology of lens is what they would want for their family and friends. These types of lens designs dramatically reduce of eliminate imperfections that traditional progressives have, and provide unsurpassed visual acuity and performance.
If you have ever felt frustrated at needing both prescription glasses and 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 glasses become clear.
There are a variety of photochromic options available. Depending on what you choose, you can customize the lenses to your needs. Some lenses darken only in direct sunlight, while others darken in little or no direct light. Some are designed to darken while you are in the car to reduce road glare while you are driving. You can even choose the color of the tint.
Glare from wet roads, light reflecting off other vehicles, and glare from your own windshield can be annoying and dangerous. 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 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 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 lenses (CR-39), 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 and compromise their performance. With a scratch resistant coating, you do not have to worry as much about minor scratches on your lenses.
Another advantage of scratch resistant coatings is that most coatings come with a one-year warranty. They are a great investment to prevent minor scratches. However, it is important to remember that scratch resistant does not mean scratch-proof. All lenses are susceptible to scratches.
We all have heard the phrase, “Different strokes for different folks.” Well, this also holds true when it comes to selecting glasses. There are different lenses for just about everybody. No matter what your particular need, there is 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 involved in work where you are looking at nearby objects above your field of vision, as with carpenters and pilots. The D-shaped segment near the bottom of the lens allows for reading.
Bifocals allow the wearer to read through one area of the lens, and to focus on distant objects through another area of the lens. As the eyes age, though, a stronger prescription is often 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.
Anti Fatigue Lenses
Anti-fatigue lenses can be used as an every day all day improvement over single vision lenses to relieve general eye fatigue in tired eyes. This type of lens design offers a slight power boost in the bottom portion of the lens much like a progressive or no line bifocal, but not nearly as drastic. This type of design can be used by individuals who work at a computer, or read for extended periods of time on a daily basis.