I would never have bought them if I knew I was being subjected to the heavy weight of glass. I wear glasses to see better. Those with strong prescriptions know how thick glass lenses can distort the face. In that respect they outperform glass up to 100 times, depending on the type of plastic used. Edit - In my previous comment I said the Doctor flat out refused to provide me plastic lenses. I would buy plastic even though they don't stand up if they offered me a better visual experience. At Cassidy Eyecare, we still supply a fair number of glass spectacle lenses, including bifocal and progressive lenses. A new, brand-name type of lightweight and resistant plastic has hit shelves: Trivex. There are several formulas to calculate how much glare you could expect. I have a passion for progressive lens designs which led to a patent in 2014. Distortion of the face is purely determined by your prescription (the amount that light has to be bent for you to see correctly). And think about this: if plastic was truly better than—or at least good as glass— and since it weighs less than glass, then why is it not used in the large telescopes we use to observe the stars or our national security CCTV cameras, etc. I have tried both glass and plastic, and I have to say glass is much better. If you choose to have a higher index material the glare (reflections) on the lens surface becomes more dominant. Plastic lenses usually wear off after time and the lens surface does not look as smooth as it was in the beginning. Nearly every day you'll find me in our shop die-brillenmacher-wallstadt.de, but when I'm not, I'm here writing about all the information to correct your vision from far to near and everything in-between. I have had a headache for five days now and it's from the heavy, heavy, heavy weight of the glass lenses. With a lens in such a condition, you will probably have some visual problems. I'm so mad! These lenses are far lighter than glass, making them less likely to slip down your nose, especially in stronger prescriptions. In contrast, we offer many types of eyeglass lenses, made of hi-index plastic or polycarbonate, which reduce lens thickness for greater comfort, a better appearance, and offer 100% UV protection as well. I'm out $400.00 and can't wear these glasses. Further, if polymer spectacle lenses are so wonderful, why is it so that the pro camera lenses are only manufactured from glass and not plastic, where the benefits served by reducing handling weight particularly for long lenses would be beneficial? CR-39 is heated and poured into optical quality glass moulds – adapting the qualities of glass very closely. All the talk about plastic being better because it filters out "harmful" U.V. Choose glasses that are sturdy, attractive, shatter-resistant, comfortable – and finally easy to wear. I am 25 years old, wearing eye glasses since childhood. For many centuries glass lenses were the only option for spectacle use. If glass is too heavy for you then take the glasses off and get a dog! is compensated for referring traffic and business to these companies. They are almost impossible to scratch. Lightweight and thinner than glass lenses, polycarbonate is more comfortable to wear for long periods of time. But frankly spoken does 4 grams per lens more or less bother you when wearing your glasses all day long? Too bad my rx wouldn't fit you. This is a scam meant to bring back people every year to buy more junk so they can make more money. I misplaced them a couple of weeks ago and put on a 10-year old pair of glass lenses to use until I found them. In that. Don't forget: our eye glasses in Canada are about four times what you pay in the US. To my surprise, the lenses got cracked and O realized how fragile these lenses are. Other than the weight factor, the advantages to glass are considerable in terms of vision and durability. In this article, you will find in-depth information about glass and plastic lenses. This is mainly because of the fact that glass lenses are more expensive, take longer to produce and have a tendency to shatter. I am determined my next lenses are glass ones. Every pair of plastic lenses I have had has scratched within about six months to make vision difficult. Multi-layer dielectric coatings are routinely deposited on plastic components. Get Aviator Sunglasses in Blue Glass Look great in these stunning Aviators! Advantages: Polycarbonate lenses are highly resistant to impact, won’t shatter, and are 10 times stronger than glass or standard plastic, making them ideal for children, safety lenses, and physical activity. Lens material can be a difficult choice when purchasing glasses online, especially if you’ve never done it before. This is only my advice as I've wasted lot of hard earned money on buying most expensive polycarb lenses. You can see the abbe value dropping with an increase with the refracted index. I have been using specsavers for years and now they say that they cannot do my prescription in glass because it has been altered. This article says the opposite. He replied, "you must be one the few who cannot get on with plastic lenses then." I have been wearing glasses with glass lenses for 35 years and have never had a problem. Although there are a variety of lenses out there on the market, the most obvious choice is between glass and plastic lenses. Standard plastic lenses are lightweight, comfortable, and inexpensive. I asked for the works, anti-scratch and all. Still, plastic lenses have mostly replaced glass lenses. However, glass lenses remain an important niche product. Optician always try to sell plastic, perhaps they get a kickback? That being said, if you drop your glass lenses, they will break, whereas a plastic lens will just scratch. Yes, it is light and tough, but as with all materials it has its limits. I have worn glasses for more than 40 years. A disposable society. The optician will do everything to convince you to buy plastic, but at the end of the day, you want superior vision. Juan. This little known plugin reveals the answer. If I had hit glass with the corner of the metal bracket, I would not even be here. The same attribute that allows high-index to be thinner, makes it heavier. Plastic lenses are impact resistant, making them a better choice for children, active adults, sportswear, and safety wear. I had bought my last pair a decade earlier and simply wanted to update my prescription and frame. Plastic lenses. They don't make glass lenses is the lie they tell you. The biggest is impact resistance. Personally, I prefer to have both lens options so that I’m armed and ready for every angling scenario. Between plastic and glass lenses, even if you were comparing two otherwise identical brand new lenses with no scratches and similar sound response (which can happen with very hard plastic lenses), there is one testing method that will always reveal the truth. Can you identify them from the reflections? It so happens that the Pineal gland behind the eyes can only function with adequate U.V. For many centuries glass lenses were the only option for spectacle use. I go overboard to prevent scratches on my lenses by literally licking the grit off before wiping the lens down. Plastic – also known as organic glass – eyeglass lenses are used today for all types of glasses, and are also best for sports and children’s glasses.. I have had them for in excess of 10 years with no issues whatsoever (oh, and they cost considerably more than the plastic). Class action suit forthcoming? In my entire life, I have broken only one lens -- it fell out of the frame onto a tile floor. Glass is not just optically superior but more durable too. As a result, the coatings peel off after a few years. These are lies! Their anti-glare feature is the best in their class and is considered to be the sole reason for the company’s grand success. You do not want to end up with restricted vision or unwanted distortions. Hearing about the better vision is cool too. Still, plastic lenses have mostly replaced glass lenses. The two best-selling eyeglass lenses are the most basic ones: CR-39 and the polycarbonate, both plastic. Luckily, the optician agreed that plastic does not provide the same quality of vision, and agreed to re-do the work with glass lenses, since he had failed to warn me about that. But for the sake of simplicity of this article, I will give you the results in the table. To demonstrate the difference, I put three common lens types side-by-side and shot this photo of them reflecting light onto a white box. As you can see in the short clip below there are big differences when it comes to impact resistance in plastic lenses. It's terrible. While plastic lenses are lighter, the quality of vision is inferior to glass lenses, they scratch more easily and they are not thinner than glass lenses (that can also be obtained in high index version). I don't wear them! None but the very cheapest cameras uses plastic lenses today and that is to lower the cost for the manufacturer, not the consumer. While they’re not the thinnest kind of lens out there, they still retain their position as the swiss-army-knife of eyewear lenses. The last time I bought plastic lenses in the U.S., it cost me over 700 dollars. Unlike glass lenses, plastic lenses cannot be coated in an elevated temperature environment. Are no longer widely used for all types of underwater activities and fishing, sportswear and! Is primarily used in microscopes, binoculars, telescopes, and just got glasses! 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