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Sunglasses
Sunglasses are eyewear used outdoors to protect eyes from ultraviolet rays. Although their function is practical, sunglasses are fashionable accessories.
758 Questions
PC sunglasses lenses are made from polycarbonate, a lightweight and impact-resistant material. These lenses offer excellent UV protection and are often used for their durability, making them ideal for active lifestyles and sports. Additionally, polycarbonate lenses are less prone to shattering compared to traditional glass lenses, providing enhanced safety for the wearer. They can also be treated for anti-scratch and anti-reflective coatings, improving overall visual clarity.
Researchers have developed a material that almost instantaneously changes from clear to dark blue when exposed to ultraviolet (UV) light, and it just as quickly reverts to clear when the light is turned off. The new material, one of a class called photochromics, could be useful in optical data storage as well as in super-fancy sunglasses.
For more than a decade, chemical engineer Jiro Abe and colleagues at Aoyama Gakuin University in Japan have been studying the light-sensitive properties of photochromic materials, particularly those derived from a compound called hexaarylbiimidazole (HABI). In its natural state, HABI is colorless, but when ultraviolet light breaks one of the bonds in the molecule, it produces a version that is dark blue. The problem has been that the transformation takes tens of seconds or longer, so the only commercial application has been sunglasses that slowly darken.
When Abe's team began analyzing HABI's chemical structure through simulations and laboratory experiments, they found that by adding naphthalene to the compound, they could accelerate the color change to about 180 milliseconds. Adding a compound called cyclophane instead of naphthalene improved the clear-to-blue conversion even more--to about 30 milliseconds. Better still, Abe and colleagues report in the current issue of the Journal of the American Chemical Society, the cyclophane version of HABI reverts just as rapidly to its colorless state when the UV light source is turned off. And the compound is so stable that the reactions can be repeated thousands of times.
If added to Plexiglas or other lens materials, the modified version of HABI would allow sunglasses to instantaneously darken in sunlight and turn clear equally rapidly whenever their wearer moves indoors. HABI's properties could also make it a prime candidate for a new generation of optical data-storage devices, in which its color on/off ability could substitute for the magnetic on/off switches that underlie today's electronic data-storage devices.
The new version of HABI developed by Abe and colleagues shows "remarkable stability and rapid switching," says chemist Devens Gust of Arizona State University, Tempe. These are qualities that few other photochromic materials have, he says, so this compound is a "significant step forward" in harnessing these materials for data processing and storage i hope that answers your question
What brand of sunglasses are worn by Benicio del Toro in the film Traffic?
randolph engineering - aviator
What is the difference between cheap Polaroid sunglasses and Oakley sunglasses?
1) Brand name
2) Material-Oakleys are light weight and strong.
3) Oakley takes time to align the lenses so they dont distort vision.
How did sam foster come up with the idea to make sunglasses?
Sam Foster began making sunglasses in the early 20th century in order to provide eyewear for people who were spending more time outdoors engaging in leisure activities. He identified a need for protective eyewear and developed stylish sunglasses to meet that need. Foster's sunglasses became popular among Hollywood actors and celebrities, further fueling their success.
Are there any matsuda 2809 sunglasses available?
Wow! I've finally found a pair selling on ebay!
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=320556377529&Category=48559&_trkparms=algo%3DLVI%26its%3DI%26otn%3D1#ht_1208wt_2039
I have been looking for years now!!
When were clip on sunglasses invented?
I don't know when they were originally invented. But they were so to say re-invented 2007 by http://www.sunclipies.com . They invented a clip-in system,where thin-film lenses are clipped into the glasses from behind. The advantage is it is super light weight and they don't change the look of the eyeglasses, but just the lens colors. They are exactly tailored to each pair of eyeglasses, using rapid manufacturing technology.
What brand of sunglasses did Steve McQueen wear on Bullit?
Persol Model 714 with custom made blue lenses.
What took the place of ray ban RB 4001 sunglasses?
The Ray-Ban RB2027 "Predator 2" is probably the closest to the discontinued RB4001 "Predator 11".
http://www.ray-ban.com/usa/products/rb2027/
Where can you find Matsuda 2809 lookalikes?
check out eBay listings by the seller jmaddengross. they have several vintage, side shield goggles that predate and, in many cases, out class the matsuda designs.
they also have a collection posted on the Flickr website as jmg opticks. hundreds of rare and mint condition models available for purchase.
Where to buy emanuel kahn sunglasses?
I have virtually every color of emanuel kahn sunglasses. If you are looking for the entire collection call 866-267-3595
How do you get scratches from sunglasses?
Unfortunately, if you scratch your sunglass lenses - you will need to replace the lenses completely as the scratches cannot be polished out. If you purchase a pair of designer sunglasses from a reputable supplier, they can usually order replacement lenses for you.
Does Wayfarers sunglasses go out of style?
Definitely wayfarers will not miss out, that's why this classical model Ray Ban 2140 was re-released in bold colors like red and turquoise.
What does it mean when someone wears his sunglasses at night?
There are several reasons why some would wear sunglasses at night or indoors: 1) to look cool and nonchalant; 2) To hide the emotions in your eyes; 3) to intimidate; 4) in some rare cases, for health reasons; 5) to hide from paparazzi; 6) or, and this is the pessimist in me, to hide an ugly mug.
Where do you send ray ban sunglasses for repairs?
Walk-in Service (Local only)
MON - SAT 19:00 ~ 22:00
(except Thursday night)
Studio Address : Unit4/ 52 Beresford RD Strathfield NSW 2135
Please, book an appointment first, before you visit.
(FREE PARKING AVAILABLE)
Where can you purchase Sarah Connor Matsuda Sun glasses?
They haven't been produced in over 20 years. Matsuda 2809's. If you find them, expect to pay 500 - $1000 USD.
check out hb devo at hbsunglasscompany.com..great wholesale pricing!
