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Lens Information
Polycarbonate lenses
At GoGetGlasses.com , all standard lenses are made of lightweight CR39-resin with a standard lens index of 1.499, coming with a completely scratch resistant coating. Polycarbonate lenses are the lightest material available (optional), and due to its high impact-resistance and durability, it also happens to be an integral material used in making bullet-proof "glass".
Single vision lenses
Single vision lenses have one fixed focus point or correction over the entire lens area. They can be used for either near, intermediate or distance vision. For instance, glasses for driving or reading are single vision.
Bifocal lenses
A bifocal lens is divided into two sections by a horizontal line, with the upper section of the lens usually used for distance vision, and the lower section used for near vision. These two different focuses in the one lens allow people with myopic or hyperopic conditions to use a single pair of glasses for both long distance and up-close vision.
Progressive lenses
Also know as varifocals, this type serves the same purpose as bifocals but without the obvious horizontal line segmenting the lenses. It provides a smooth transition between distance and near vision, as well as the capability for viewing intermediate ranges.
Coating
Anti-Glare
Anti-glare coating is ideal for computer use and night driving. They work by increasing the light transmission through the lenses, providing you with the clearest, sharpest vision at all times.
Anti Scratch
No eyeglass lens material is scratch resistant. However, a lens that is treated front and back with a clear, hard coating does become more resistant to scratching, whether it's from dropping your glasses on the floor or occasionally cleaning them abrasive material.
Super Thin
Super thin lenses have impacted eyeglasses in a very significant way. Most Prescription eyeglass wearers are nearsighted, and a basic physical attribute of nearsighted lenses is that their edges are thicker than their centers. The stronger the prescription, the thicker the edges. Most of today's fashionable frames are made of plastic or metal with rims thinner than the lens itself. Aso very popular are rimless mountings, where the lens edges are completely exposed. in either case, the lens edges are highly visible, and thicker edges can detract from the appearance of the eyewear. Gogetglasses.com provides two kind of thinner lenses: 1.67 called thin and lite, 1.76 called super thin.
Ultra-violet Protection
Another lens option that is useful but invisible to the naked eye is ultraviolet (UV) protection. Just as we use sunscreen to keep the sun's UV rays from harming our skin, UV treatment in eyeglass lenses blocks those same rays from damaging our eyes. Overexposure to ultraviolet light is thought to be a case of cataracts, retinal damage and other eye problems. An ultraviolet treatment is simple and quick to apply to most plastic prescription eyeglasses lenses, and it does not change the appearance of the lenses at all.
Tint
As opposed to the changeable photochromics, another option in colored lenses is a tint, which remains constant at all times. Tints are available on our glasses with the following colors: brown, and grey. Lighter tints are used primarily for cosmetic purposes to enhance a wearer's looks. Darker tints allow the wearer to use the lenses as sunglasses.
Light-adjusting lenses for prescription eyeglasses
Also known as photochromic lenses, are a type of coating that tints lenses but with a unique feature. When indoors, the lens tint will be very light and allow as much light in as possible. However exposed to strong sunlight outdoors, the lenses will get dark depending on the direct exposure to sunlight. Please be advised that these lenses do not get as dark as typical sunglasses and will tint up to approximately 60% darkness.
Progressive lenses for prescription eyeglasses
Also known as varifocal lenses or just varifocals, are a type of bifocal but without the line. This lens is usually called no-line Bifocals and is preferred by people who don't want the line to be obvious on their glasses. They serve the same purpose as bifocals so as to provide both distance and reading vision on a single lens.
Photochromic lenses
Photochromic lenses provide the correct amount of protection for the varying light conditions you experience.
The Photochromic lenses are darken when being exposed to UV (ultraviolet) rays. Once the UV rays are not getting to the lenses (for example by walking indoors), the lenses will gradually return to their clear state.
Thanks to photochromic lenses, eyeglass wearers can purchase one set of glasses that will allow them to see inside, as well as reduce the glare of the sun when outdoors
Important facts are:
- Clear as an ordinary lens indoors and at night
- Block 100% of sun’s harmful UVA & UVB rays
- Available in Gray or Brown
- Because photochromic compounds fade back to their clear state by a thermal process, the higher the temperature, the less dark photochromic lenses will be. This thermal effect is called "temperature dependency" and prevents these devices from achieving true sunglass darkness in very hot weather. Conversely, photochromic lenses will get very dark in cold weather conditions, which make them more suitable for snow skiers than beach goers while outside.
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