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63 About this deal
No particular lens material is “best.” This depends on your prescription, lifestyle and budget. Glass is optically superior but is also prone to shattering and can be very heavy if you have a high sphere and /or high cyl prescription. The following configuration options significantly affect your perception of sunglasses in terms of contrast:
Let’s start now with the differences between glass and plastic lenses, so you can find out which is now better for you in everyday life. What Is the Advantage of Glass Lenses Over Plastic Lenses for Sunglasses?However when it comes down to it, if you are investing in a great pair of sunglasses that you want to last for a long time, then it is highly recommended that you should choose lenses which have at least the first four types of lens treatments. The next advantage of sunglasses with glass lenses is the hardness of the glass surface. We ourselves wear our sunglasses, of course, and the difference in terms of longevity of glass lenses compared to plastic lenses is stark. We can’t put it any other way. Even after years of use, whether in the car or frequent swimming pool use, the surface remains almost unscratched and unworn. CR39 lenses are the most prevalent plastic lens material and are nearly half the weight of glass. They have the highest uncoated scratch resistance amongst all types of plastic lenses. CR39 is very easily tinted making it ideal for prescription sunglasses.
This makes polarized sunglasses a popular choice for people who spend a lot of time outdoors, on the road and near water, including boaters, anglers and lifeguards who swear by polarized lenses. In addition to reducing uncomfortable glare, these can also boost your visual acuity — polarized lenses can let you see below the surface of the ocean or a lake.
Non-Prescription Replacement Sunglasses Lenses
Blue lenses. This tint can reduce glare in rainy or overcast weather conditions. Blue or purple lenses also work well in mist, fog and snow. What’s more, blue lenses can have a calming effect on the eyes. In turn, scratches on plastic lenses usually cannot be prevented even with optimal care. So you can already see how big the differences are in terms of surface hardness of real glass lenses in sunglasses compared to plastic lenses. Glass lenses may not be as common as they once were, but they still offer exceptional optics, plus they are more durable and less prone to distortion. With clearer, longer-lasting clarity than other lens materials, glass lenses are a great choice for those who rely on their sunglasses all day or must perform detailed work outdoors.
Polycarbonate lenses are made from plastic, known for their impact resistance and can be exceptionally thin and lightweight. They’re ideal for active use if you put high physical demands on your eyewear. Children and sportspeople favour this lens material for its hard-wearing properties and inherent UV protection. The Egmont sunglasses feature polycarbonate lenses that are super scratch resistant and ultra-durable. Glass lenses are a classic choice and provide optimum clarity. But they can be really heavy, and if you’ve got a prescription, they get even heavier. Not to mention glass lenses are not the safest choice for eyewear, especially for kids. In other words, glass is more efficient at bending light than plastic lenses. Which in optics, is the holy grail material for making lenses (as long as you don’t drop them.)
Reglazing Sunglasses
High-index lenses refers to any type of plastic or mineral lens material with a refractive index higher than 1.5 (standard index.) High index lenses can be made from CR39, polycarbonate, Trivex or glass in various mid to high indexes ranging from 1.56, 1.60, 1.67 and 1.74. Generally, the higher the index of lens, the thinner it is. Sunglasses with real glass lenses are found today only in the higher quality sunglasses manufacturers. The beauty of glass lenses is their durability. It is not uncommon for sunglasses with glass lenses to look practically worn from the surface after eight to nine years, even though they have not been treated with extreme care. Furthermore, glass is much heavier at nearly twice the weight of CR39 plastic lenses. Not ideal when they could easily weigh more than your spectacles themselves. The various types of sunglasses on the market can seem endless — you can choose from prescription sunglasses, polarized sunglasses, fashion sunglasses, sports-performance sunglasses, colored lenses and more. Which fits your needs? The type of lenses and the best style of frames for you will depend on the amount of sun protection and glare reduction you’re looking for, combined with what best suits your face shape and personality. Sunglasses and eye health An oval face is slightly longer than it is wide. The good news if this describes you: Just about any style of frame can work, so try aviators, Wayfarers, wraparounds or any geometric shape that suits your personality.
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