I first heard it about fifteen years ago, when one of my customers had asked me if their new Transitions lenses needed to be put in the freezer overnight in order to be activated. The Science of Transitions Lenses. Thank you. By immersing the lenses in a chemical bath, the photochromatic molecules are actually absorbed to a depth of about 150 microns into the plastic. THE BEST LENS FOR BEHIND THE WHEEL. When they’re hot (like in the summer), the lenses will change slower and won’t get as dark. The price of prescription eyeglasses costs not more than $200. The greater the intensity of UV rays, the darker the lenses become. Polarization adjusts to match the level of glare outdoors for noticeably crisper, sharper vision. Also the thickness of the lens could affect it. Transition lenses offer the convenient advantage of eye protection from the harsh rays of the sun on demand. trade flag- with empty trade cart image by Stasys Eidiejus from Fotolia.com Transitions lenses are photochromic and respond to sunlight by darkening. I have a problem that I hope you can help. Temperature affects how Transitions change. As the molecules change their structure, they absorb more of the light passing through, and that's what darkens your lenses. This makes these glasses ideal for anyone who is sensitive to light or who simply wants the luxury of having prescription sunglasses without having to buy an extra pair of glasses. So now you know, and if you were one of those who believed the myth, now you can stop putting your lenses in your freezer. So why does this belief persist? The greater the intensity of UV rays, the darker the lenses become. Transition lenses rarely have any problems. Patients who choose photochromic lenses will find that they squint less, suffer less eye fatigue and see with improved contrast. This means that it will take somewhat longer for the lenses to adapt from dark to clear. Please note, comments must be approved before they are published, © 2020, Hicks Brunson EyewearPowered by Shopify. Help, how can I fix them please. This means that they will fade back faster. This myth just doesn’t seem to go away. If you move into a shaded area outdoors, they will stay darker longer than they would on a warm day. This change in structure is what causes the lenses to darken in sunlight. There are trillions of photochromic molecules in the lenses that change structure when exposed to UV light. 3. They are constantly restructuring themselves based on the amount of UV light they are exposed to, which changes continuously as you move about from indoors to outdoors and through shaded and non-shaded areas. A pair, though, with photochromic lenses cost about $400-$650 or more. How do transition lenses work? Transition lenses, also known as photochromic, are eyeglass lenses that are clear indoors and change to dark in sunlight, according to All About Vision. Away from sunlight, lenses reverse back to a clear state through a thermal process. No wonder it is still around. The cost of transition lenses is about $100-$450 per pair. Wearing transition lenses is a great way to block out the sun … Photo: Molecules inside photochromic lenses cut off light like rapidly closing blinds. In the absence of activating light the lenses return to their clear state. Transition lenses use a chemical process to adjust the color. The transition lens is available in a variety of shades ranging from gray to green. There are two types of Transitions(tm) lenses. And it is normal to take minutes to adjust the color of the lenses. So what are the many benefits, let’s dive in: 1. I tested the lenses myself and the lenses will only turn to about 30% darkness even after few hours of exposure to the sun. Transitions lenses are the #1 eyecare professional recommended adaptive or photochromic lens worldwide.Transitions lenses are equipped with patented, photochromic dyes that enable the lenses to rapidly activate, or darken, when they are exposed to the sun’s ultraviolet light. Known as "photochromatic" lenses, these eyeglasses darken under bright sunlight to serve as sunglasses, then return to a clear lens when the wearer moves indoors or out of direct sunlight 1.As helpful as these glasses may seem, a few problems exist that make their use a tossup. I thought it sounded a little strange, but I checked it out and discovered it was not true. It is a comfortable and very subtle change, so subtle that you might not even realize that your lenses got dark. Also after a couple of years the Transition lenses seem to stop changing as much (still change but not as much). To answer that question, we first need to understand the science of how Transitions lenses work. Transition or reactions lenses are glasses that change tint with light conditions. The other is darker by default but works in the car. There are many great benefits to having photochromic lenses, they do a great job at providing a comfortable viewing experience when you are outside. These lenses have been around for a decade or more, and they offer the convenience of sunglasses without having to wear them over your prescription glasses or having to constantly switch between the two. was the same both days. How fast do Transitions lenses work? It is important to understand that temperature does have an effect on the lenses, but simply freezing them does not change them permanently. These photochromic lenses are extremely dark outdoors and are compatible with many frame brands and styles. DriveWear lenses feature photochromic molecules capable of reacting to both visible and UV light, as opposed to standard transitions, which react only to UV light. Transition lenses don’t change behind the windshield of a car. Photochromics change tint outdoors, control glare and are 100 percent UV protective. When it is colder outside you may notice that your Transitions lenses seem to get darker than they do when it is warmer. Wait, what? I hope this helps. Transitions lenses offers to remake the lenses within 30 days if patients are not completely happy per their website. Save it for your ice-cream and frozen veggies. Transitions lenses are compatible with all frame styles, and available in all types of lens materials and designs, from high index to shatter-resistant materials, from single vision lenses to progressives. Transitions lenses begin to darken the moment they are exposed to UV light. How do photochromic lenses work? Transitions® Vantage® Meet the world's only intelligent lens that automatically polarizes as it darkens outdoors. They offer a convenient way to protect your eyes outdoors from UV rays and bright light without having to carry around a pair of sunglasses. The driving/car type takes longer to transition. It is depend on the presence or absence of ultraviolet light. When the lenses become warm the molecules speed up and become more reactive. Though transition lenses darken in response to sunlight, it is possible to make them darker. The automatic darkening makes it seem like the change is seamless when you are going outside, to me it just makes it seem like someone just turned the brightness down on the sun. Photochromic lenses are a special type of lens that starts out clear and turn dark in the bright sunlight. When they are colder they fade back slower, and when they are warmer they fade back faster. Self-tinting lenses must be effective and offer full UV protection. Transitions ® Drivewear ® lenses are the only polarized sun lenses that adapt to light behind the wheel and outdoors, helping remove glare off the road and car hood for a picture-perfect drive. When the lenses become cold the molecules begin to move slowly. So what IS the best way to ‘activate’ transition lenses so that they will darken the most? Yesterday they got real dark but today not so much, temp. Beyond this basic process, environmental conditions can significantly impact the performance of photochromic eyewear. Transition eyeglasses lenses are the most popular, because it simply performs better than the others. Transition Lenses Problems. If you want more convenient eyeglasses use for outdoor and indoor. In order to be convenient, self-tinting lenses must adjust very quickly to the changes in light conditions. Transition lenses generally take at least 3 years to wear out. One of my patients recently purchased Transitions Flat top 28 plastic lenses, and she came back complaining that the lenses do not turn dark. Go outdoors in the sun to make your transition lenses the darkest shade possible. I can’t remember the last time I got this question in my store, but I began thinking about it recently and a quick google search revealed a blog post with lots of comments from glasses wearers reporting that their optician had actually instructed them to “activate” their new Transitions lenses by putting them in the freezer overnight. Have you ever been told that Transitions lenses need to be put into the freezer in order to be “Activated”? UV intensity is another variable. If new (recent) models, they'll transition in 2 - 5 mins. Recommend not only a specific type of Transitions lens for each patient, but recommend a color option based on frame selection and style! Customized or pre-made, glasses with transition lenses price as much as $200-$400. This is much better than a simple coating, which would only be about 5 microns thick and would not provide enough molecules to make the lenses sufficiently dark. DriveWear was developed by the Transitions corporation, the creators of transition lenses, in response for this particular need. The UV is less intense before 10:00 Am and after 6:00 PM so time of day also plays a role. There are opticians out there responsible for spreading this myth. To attain optimal vision, self-tinting lenses must turn very dark in the sun and completely clear indoors. Roy, Temperature is one variable. The answer is yes, and they’re called DriveWear lenses. Transitions lenses are made with a proprietary and patented photochromic dye system that enables them to activate, or darken, when exposed to the sun’s ultraviolet light. The best quality photochromic lenses can offer very quick transition times. If there were more clouds blocking some of the suns UV on the second day, then that would explain why they did not get as dark. Julbo's Zebra lens for example boast high speed activation of between 22 to 28 seconds.However, as photochromic compounds fade back to their clear state by a thermal process, the higher the temperature, the less dark photochromic lenses will be. eyeglasses image by Pix by Marti from Fotolia.com, trade flag- with empty trade cart image by Stasys Eidiejus from, Copyright © 2020 Leaf Group Ltd., all rights reserved. Photochromic lenses, sometimes referred to as transition lenses, are eyeglass lenses that will turn dark (resembling sunglasses) in sunlight and become clear again when indoors.This is the result of chemical responses to the presence (and absence) of ultraviolet light. Also after a few years, your lenses seem to slightly change colors but that may vary depending on whether they are plastic, polycarbonate, or some of the other types. My lenses well only darken half way. Time of day also matters. Other terms sometimes used for photochromic lenses include \"light-adaptive lenses\" and \"variable tint lenses.\" Transition lenses, or photochromic lenses, are the lenses that darken in the sunlight and lighten in softer light or the dark. Transitions Optical Incorporated states that transition lenses are treated to block harmful UVA and UVB rays from the sun. The Spic-e T sunnies’ lenses also change colour from a light yellow/orange to a … I believe people have noticed this effect that cold temperatures have on the lenses, and then some of these people have made the leap to believing that placing a new set of Transitions lenses into the freezer overnight is needed to activate them. Matt, Fortunately it is not necessary to “activate” Transitions lenses. One is UV triggered, and doesn't transition in cars which are UV protected glass. 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