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Types of Lenses

What are Bifocal, Trifocal and Multifocal Lenses
 
If you find that your usual set of glasses is not enough, you may need bifocal lenses. Especially for those over the age of 40, presbyopia can be a reality. Presbyopia causes a person to have blurred vision when viewing things within a close distance, such as books, newspapers, and the computer screen. Hobbies such as sewing, knitting, and even simple tasks such as handwriting can be greatly hindered by presbyopia.
 
Presbyopia is not the only reason why people have issues seeing at various distances. While most children, teens, and young adults have difficulty seeing either from far distances or near distances, some people have difficulty seeing at all distances. People who wear glasses to see things that are far away may suffer from eye strain when doing intricate viewing such as reading.
 
Some people buy a separate set of glasses for these situations. Often referred to as reading glasses, these glasses can be purchased in a grocery or drug store, or prescribed by an eye doctor. While this is a common solution to this problem, it can be difficult to constantly carry two sets of glasses with you. Even if you can carry both pairs, it can be frustrating having to constantly switch between one set of eyeglasses and the other.
 
Multifocal lenses allow you to see comfortably at all distances. The main part of a bifocal lens allows you to see things that are at a distance. A smaller part of the lens, located in the lower portion, is stronger and allows you to clearly see things that are nearby.
 
Trifocal lenses operate similarly to bifocal lenses. Trifocal lenses have three points of focus to allow you to clearly see from distances that are far, intermediate, and close. The upper portion of the lens is for intermediate viewing, the middle is for distance viewing, and the bottom portion is for close-up viewing. Computer viewing is normally considered an intermediate distance, so people that work with computers may have trifocal lenses with a larger area for intermediate viewing.
 
Multifocal lenses can grant you the ability and confidence you need to carry out your day-to-day tasks. You will no longer have to worry about being able to read street signs, a menu on a wall, or a newspaper in front of you. Multifocal lenses allow you to see at all distances without having to carry two or even three sets of eyeglasses.
About Bifocal, Trifocal and Multifocal Lenses
If you find that your usual set of glasses is not enough, you may need bifocal lenses. Especially for those over the age of 40, presbyopia can be a reality. Presbyopia causes a person to have blurred vision when viewing things within a close distance, such as books, newspapers, and the computer screen. Hobbies such as sewing, knitting, and even simple tasks such as handwriting can be greatly hindered by presbyopia.
 
Presbyopia is not the only reason why people have issues seeing at various distances. While most children, teens, and young adults have difficulty seeing either from far distances or near distances, some people have difficulty seeing at all distances. People who wear glasses to see things that are far away may suffer from eye strain when doing intricate viewing such as reading.
 
Some people buy a separate set of glasses for these situations. Often referred to as reading glasses, these glasses can be purchased in a grocery or drug store, or prescribed by an eye doctor. While this is a common solution to this problem, it can be difficult to constantly carry two sets of glasses with you. Even if you can carry both pairs, it can be frustrating having to constantly switch between one set of eyeglasses and the other.
 
Multifocal lenses allow you to see comfortably at all distances. The main part of a bifocal lens allows you to see things that are at a distance. A smaller part of the lens, located in the lower portion, is stronger and allows you to clearly see things that are nearby.
 
Trifocal lenses operate similarly to bifocal lenses. Trifocal lenses have three points of focus to allow you to clearly see from distances that are far, intermediate, and close. The upper portion of the lens is for intermediate viewing, the middle is for distance viewing, and the bottom portion is for close-up viewing. Computer viewing is normally considered an intermediate distance, so people that work with computers may have trifocal lenses with a larger area for intermediate viewing.
 
Multifocal lenses can grant you the ability and confidence you need to carry out your day-to-day tasks. You will no longer have to worry about being able to read street signs, a menu on a wall, or a newspaper in front of you. Multifocal lenses allow you to see at all distances without having to carry two or even three sets of eyeglasses.
 
What are Hi-Index 1.74 Lenses
 
High index 1.74 lenses are the newest technologically advanced ultra thin lenses that offer a more aesthetic look for individuals who wear thick lens eyeglasses, which cause the eyes to appear magnified. They also are available to individuals who wear glasses that cause the eyes to appear smaller than they truly are.
 
High index lenses available in the United States are normally made from plastic materials offering faster fabrication and less weight compared to glass lenses. Additionally, plastic lens can be placed in a wide variety of different frames. These lenses are less dense as they usually have a specific gravity level that is lower than the counterparts of traditional plastic and glass. When adding up the advantages of thinner lenses and lighter frames, the result is glasses that weight less and are less bulky. In addition, with these lenses, the eyes appear normal sized, offering an improved appearance.
 
High index lenses also are available in aspheric shapes and designs. With this aspect, the front curvature of the lens is gradually changed towards the edge of the glass. This feature allows the individual’s eyes to look normal sized instead of minified or magnified. Aspheric designs also make the use of thinner lens possible, adding to the aesthetic value. High index lenses, when worn by those who are near-sighted, offers a more apparent change in appearance, when compared to far-sighted individuals. Because of the changes in the materials of the lens, they can be thinner in the center of the lens and when these lenses are combined with an aspheric design, they offer noticeable changes in appearance.
 
Although these lens reflect more light than regular glass or plastic lens, high quality lenses are offered with an anti-reflective coating. Anti-reflective coating not only cuts down on the amount of glare that occurs during night driving, but it also offers better aesthetics in person and when being photographed. When choosing these lens, smaller frames are best suited with the 1.74 lens. Because there is less lens used, thickness and weight are reduced. Choosing frames that are smaller also reduces the amount of aberrations that can be experience, especially for those who need strong corrective eyewear.
 
Most ultra thin lenses are offered in both UVB and UVA rays that are available in transitions, photochromic, tinted, polarized and mirrored. For those who require strong corrective eyewear or currently wear wrap arounds or large frame glasses, these new high quality lenses not only offer improved aesthetics, but provide lighter and less bulky eyewear. Glass ultra thin lenses are also available, when doctor recommended.
 
Vizio Optic carries Hi Index 1.74 lenses and you can purchase them with your glasses. See prescription lenses for additional information.
 
Why You Need Anti Reflective Coating
 
If prescription eyeglasses are purchased today, chances are the lenses will have an anti-reflective coating. This coating will not only improve vision, but will also improve how the glasses look on the face. Someone looking at a person with the anti-reflective lenses will not see a blurry effect on the lenses. Often the position of the sun will totally obscure a person’s eyes if they are not wearing glasses with anti-reflective lenses. If they are wearing glasses with the coating, looking at their eyes will be as clear as if the person were not wearing glasses.
 
What is Anti-Reflective Coating
 
The coating, often called AR coatings, is made of layers of metal oxides that are applied to both the front and back of the surface of the lens. Each layer will block reflective light, which results in the reduction of the glare effect and eye blur. The layers of anti-reflective coating can also be applied to the back of sunglasses, since clear eye contact is not so important when wearing sunglasses. Even being applied just to the back of the lens will reduce glare.
 
For those who wear the light, thin high-index lenses, the anti-reflective glasses are better since thinner lenses reflect more light. When the anti-reflective lenses are on the glasses, not only will the light-weight glasses be more comfortable to wear, they will also result in better vision day and night.
 
Benefits of Anti-Reflective Glasses
 
Working on a computer each day can cause eye strain. The glare from the computer screen can make it difficult to see, resulting in eye strain. Wearing lenses with the coating will cut down on the glare and ease the eyes. Since the anti reflective coating on the lens also reduces glare, they will eliminate the halo-effect around car headlights, which is a benefit when driving at night.
 
Taking Care of Glasses
 
The anti-reflective glasses should only be cleaned with special micro-fiber cloths purchased from an optician, as small scratches are more visible on the lenses. Wet the glasses first and use a dry cloth to blot them dry. Cleansing products with harsh chemicals can ruin the coating.
 
What is Scratch Resistant Coating for Your Eyeglasses
 
Scratch resistant coating for your eyeglasses is one of the best investments you can make in your vision care. Cleaning the eyeglass lens with scratchy material or dropping your eyeglasses on the ground can cause an unsightly permanent scratch on the lens that can impair clear vision. By opting for scratch resistant lenses when ordering a new pair of eyeglasses or sunglasses, the wearer dramatically reduces the possibility that one or both lenses will be damaged by scratching.
 
Most lenses used in eyeglasses today feature materials that have already built in a scratch resistant coating. But it is important not to assume that the lenses being used in the eyeglasses you are ordering automatically feature scratch resistant lenses. Ask your optician if scratch resistant coating is an option on the type of eyeglasses you are purchasing. By asking for this added feature for your eyeglasses, you have peace of mind that the lens surface will have an added measure of durability against accidental scratching.
 
Unfortunately, once a pair of eyeglasses is already scratched, adding a layer of coating will not remove the existing scratches. If the scratches are numerous or large enough to interfere with clear vision, you may want to consider replacing the damaged lenses with scratch resistant lenses.
 
No coating added to eyeglass lenses can make them 100% scratchproof, so it is important to treat eyeglass lenses treated with a resistant coating with special care. When not wearing your eyeglasses, store them in a case with a soft interior and keep this away from pets and children. Ask your optician for advice about cleaning cloths such as microfiber cloth which won't scratch the lens during the cleaning process unlike tissues or paper towels which can be abrasive. Your optician can also suggest the proper cleaning solutions for cleaning lenses to help avoid problems with scratching the surface of the lens.
Introduction to Color Changing Eyeglass Lenses - Transition Lenses (Photochromic Lenses)
There are a wide variety of prescription lenses for eye glasses available for purchase. With so many options, it can make for a difficult or confusing decision. One of the newer lens technologies is incorporated in Transition Lenses. What are transition lenses and what are the benefits of wearing them? This article will help to provide the answer.
 
Transition lenses, otherwise known as photochromic lenses, are color changing lenses for eye glasses. These lenses are clear while worn inside and in dark settings or at night. The lenses automatically darken when exposed to ultraviolet radiation, essentially converting from regular prescription eye glasses to prescription sunglasses and protecting the wearer's eyes from 100% of harmful UVA and UVB sun rays. The photochromic technology allows for a substantial change in lens tint within the first minute of exposure to ultraviolet radiation. Lenses continue to darken over the following fifteen minutes. The process of returning to clear follows a similar pattern. Color changing lenses do not darken due to artificial lightening because the ultraviolet wavelengths from the sun trigger the change and these wavelengths do not come from artificial lighting sources.
 
Photochromic lenses are available, for the most part, in the same quality and variety of lenses as normal eye glass lenses and include the following: plastic, high-index plastic, polycarbonate, and Trivex lenses. A polymer film is then paired with the lenses to provide the additional reversible darkening effect for sun protection. Wearers can choose between lenses that change color to varying shades of either gray or brown depending on the lighting conditions.
 
Studies show that conditions such as cataracts result from recurring exposure to ultraviolet radiation. Wearing color changing lenses may lower potential risks for eye damage resulting from years of exposure to ultraviolet radiation.
 
Eye glass wearers that spend a lot of time working outside may benefit with these lenses since they will not have to purchase or remember to carry with them a second pair of expensive prescription sunglasses to protect their eyes.
 
Although many options are available for lenses, knowing the facts and benefits will help to decide which lenses are best for your personal needs.