The best lenses on the market to date are “Drivewear” lenses which are photochromic polarized lenses. 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. 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. How Long Do Photochromic Lenses Take To Change Colour or React? Photochromic lenses are made of many lens materials including plastic, glass or polycarbonate. Photochromic lenses are clear lenses that react to ultraviolet rays. There are a few pro's and cons of photochromic lenses and sunglasses. Modern windscreens block UV light. Photochromic lens technology is used on prescription glasses, thereby eliminating the need for you to buy prescription sunglasses. Find out more about that here. Photochromic lenses are often recommended for playing sport or if you are particularly sensitive to light, as the lens design can provide optimal comfort in all light conditions. Photochromic dyes do not work well in common plastic materials, so new polymers compatible with dyes are used. Photochromic units have been employed extensively in supramolecular chemistry. Photochromic Lens Temperature Dependency: Photochromic lenses change state in a chemical and thermal process which can be affected/limited by a process known as 'temperature dependency'. Transitions XTRActive lenses blocks 88% of blue-violet light outdoors and 34% indoors. The polarised filter reduces glare and reflections from the road and other reflective objects while the photochromic filter adjusts the colour and tint of the lenses to suit the driving conditions. XTRActive lenses are also designed to react inside the car and behind the windscreen to protect your eyes from harsh sunlight while driving. Photochromic sunglasses are an awesome pair of equipment you have to purchase right now. The reason why they could be gained much popularity is that they get darkened like sunglasses on getting exposed to UV rays. This a very competitively priced lens and comes with our standard all-inclusive coating package. Cold weather also increases the time taken to return to a clear shade. What are The Advantages and Disadvantages of Photochromic Lenses? Skiers who constantly move around the mountain, or those who do their skiing in different places, will also love photochromic models. The shade in the lenses dims once it is strike by the UV rays, so as to give optimal protection. The optical industry is constantly improving and creating new lenses. It also means you can have photochromic lenses even if you do not have a glasses prescription. What are photochromic lenses and how does it work? Transitions Eyecare Professional Brand Tracking (MSW-ARS, 2016: Brazil, Canada, Colombia, France, Germany, Italy, Mexico, Spain, United Kingdom, and … To overcome this problem, lens manufacturers have introduced photochromic lenses that are designed primarily for outdoor wear and for use when driving in sunlight. Photochromic lenses, also known as light-adaptive lenses, are lenses that start off clear, or nearly clear, and then darken when exposed to sunlight. Mesa Grand. Please don't hesitate to contact us should you require additional information and we will be happy to assist you in selecting the correct lens options for your prescription, lifestyle and budget. They typically take around 30 seconds to fully darken and approx 2 - 5 minutes to return to a clear state. Other names for these color changing things of wonder are “light-adaptive lenses” or “variable tint lenses.” The name that we know it most commonly for is because of Transitions Optical, the biggest photochromic lens distributor in the world.