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Fashion and protection always go hand in hand with great eyewear. Remember those old photos of grandpa, where you could only see the flash reflected in his glasses in the photo and not his eyes? The anti-reflective coating would have been his answer. Sometimes it doesn’t even look like there is a lens in the frame. Read on and learn the different types of lens coating available.
Polarized/Anti-Reflective Coat - They fend off reflective glare from the sun. Polarized lenses are commonly used by those who indulge in snow and water sports. Anti-reflective coated lenses reduce glare created by light reflecting off the back surface of your sunglasses.
Mirror Coated - The amount of light that enters your eyes is limited so that one is more comfortable. It's coated on the front of the sunglasses, controlling how much light passes through the lenses. It incorporates all colors including copper metallics, silver and gold. Almost all colors are available. The color you choose doesn't alter your color vision, it is the tinted lens that is under the coating that determines how the mirrored sunglasses affect your perception of color.
Gradient - It is tinted from the top down, with the top portion being the darkest. These are suitable for driving as they shield one's eyes from direct sunlight and allow light through the bottom of the lens so as to see the dashboard clearly.
Double Gradient -These lenses are also tinted, but from the bottom up, where the top and bottom are the darkest with the middle consisting of a lighter tint. It is perfect for those who don't want sunglasses that are too dark. It shields one's eyes from bright sunlight and reflected light from sand, water and other surfaces with reflectiveness at ground level.
Photochromatic - These lens adjust the level of darkness depending upon the amount of ultraviolet rays that they are exposed to. These lens darken when light hits its surface, automatically creating a sunglasses effect. These are best suited for normal eye glasses with photochromatic lens that can be used indoors and outdoors as well, since they lighten up and resume transparency when away from the sun.
Blue Blockers - It blocks blue light and generally has amber lenses. It is said that blue light may be harmful and can increase the risk of damaging one's eyes with macular degeneration. It can be used by skiers, boaters, pilots and hunters since the contrast is peaked.
Antireflective coatings allow more visible light to pass through the lens material that is in front of your eye and impeding light transmission by bounce reflection or absorption, The greater the negative power of a prescription the more light is lost due to reflection because the base curve of the lens needs to be flatter and the greater the positive prescription the light is lost due to absorption because the lens thickness through the optical center must be so thick. The more light that can reach the screen at the back of your eye the better you will see contrast and therefore the better you can see. AR coatings are suggested for all patients in higher prescriptions and most anyone wearing higher index materials because high index lenses are generally ground on flatter base curves.
Anti-reflective coatings are available a variety of styles, colors and other choices and also quality. Anything from a single layer coating that will wear off in less than a year to multi layer ones that will last and are warranted to last over two years,
Photo sensitive glass, plastic and other index materials are the newest must have in the optical lens industry. These lenses will darken when you go into sunlight and lighten back up after the exposure has diminished. There are several manufactures of these coatings with varying degrees of effectiveness and they are available in a variety of colors,
Tough resilient lens materials have made drilling lenses for rimless frames no problem any longer and the more modern rimless frames that are made of stainless steel or titanium metals combined with super light weight lenses have resulted in very light weight comfortable eyeglasses . These eyeglass technologies have revolutionized the industry. We have offered a unique feature where you can design your own shape.
Excerpt By Naomi Sarah
From the Summer Sun
Most savvy sun seekers wouldn't think of stepping outside without first lathering up with sunscreen. But most people forget about - or are unaware of - the importance of protecting their peepers from the sun. Sunglasses are more than a fashion accessory. According to the American Academy of Ophthalmology, studies have found that people who don't wear eye protection have up to three times more cataracts than people who wear sunglasses or brimmed hats. In addition, overexposure to the sun can cause retinal damage, headaches and photokeratitis - sunburn of the eye.
When shopping for shades, the most important thing to look for is a UV-blocking feature. According to the American Academy of Ophthalmology, long-term exposure to ultraviolet (UV) rays is linked to eye disease. To protect yourself, sunglasses should block or absorb at least 99% of UV rays.
Labels on sunglasses use many different terms. Here's a key to what they mean:
• By adding chemicals to lens material during manufacturing or by applying lens coatings, manufacturers boost the ultraviolet (UV) protection factor in sunglasses. Look for sunglasses that say "99% UV protection" or "UV absorption up to 400nm."
• While some manufacturers make infrared-related health claims, research has not shown a close connection between eye disease and infrared rays.
• There's controversy over whether blue light is harmful to the eye, but amber lenses can improve contrast and makes distant objects appear more distinct.
Whichever sunglasses you choose, keep in mind that eye protection is always in style.
Source: American Academy of Ophthalmology, http://www.eyenet.org
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